You're absolutely right!!
But I do not agree with you that "u.f.o.'s" use some kind of propulsion to move.
From our technical point of view, people think that everything that moves should need some
sort of an engine that uses some kind of fuel to burn to put a machine in motion.
Yes, also the mixer they use in their kitchen, because the electricity that is used to drive the
motor of that thing is generated in a plant where they burn fuel like coal or split uranium atoms.
But that is just classic "box thinking", so what happens if we start to think outside the box?
What if the u.f.o.'s don't burn fuel at all, because there is simply no engine??
When there is no engine, it opens the option to think there is also no propulsion involved, so what
about the possibility that what we see as motion, is acutaly movement trough time?
That would account for the spectacular acrobatics, the incredible "speeds" and not be affected by inertia.
It would also explain why they can "move" at the same "speed" under water as they do in the air and
suddenly appear and disappear in the blink of an eye.
In this case, it is possible that whatever those "u.f.o.'s" are made of, is some kind of material that can
be manipulated at an atomic level to do whatever the "pilot" wants it to do, using just the energy that
is enclosed in every atom, which never runs out.
Think about it, every atom we know of is constructed of protons, neutrons electrons and so on, but
I think we have to dig a little deeper to understand where the energy is coming from.
I think that what we know as solid matter, is nothing more than the outer skins of atoms (the electrons)
repelling each other.
As we know, electrons have a negative electric or magnetic charge and they move around an atom at
incredible speeds and never slow down.
Now picture an ordinary fan.
When the fan is off, it is easy to put your hand between the blades of that fan, but when the fan is in
motion, it is a lot more difficult to put your hand between the blades.
The faster the blades turn, the more the blades would seem to look and "feel" like an solid object and
that is why we have the illusion that when fan blades turn at say the speed of light, it is a solid object
that we just can pick up with our hands.
Just like we have the illusion that we also are made of solid matter, where everybody knows that atoms
are just particles together in a lot of empty space.
But .... for a better understanding of what is going on, we need to know what a particle like an electron is
made of.
And here is where the story of the big bang and the relativity theory of my hero Dr. Albert Einstein are
coming into view.
Dr. Albert Einsteins relativity theory E=MC² states, that when two objects approach each other with
100 Mph, they would collide with a force equal of 200 Mph.
E=Energy, M=matter and C=light speed.
So, when two fotons collide with each other at light speed, they collide with light speed squared and
become entangled, so the formula could also be read as M=EC²
That means that those two fotons would attract and repel each other at the same time and keep
each other "prisoner" if you forgive me the term.
This is also known as the string theory and for a more visual aid to this, picture the chinese ying-yang sign.
Beware, this is not at an atomic level, but at an particle level and the chinese did this already using a
powerful l.a.s.e.r. Create solid matter with a laser

Now about the "radiation" that is apperently coming from the "u.f.o.'s".
It seems to me that it is not radiation at all, but merely a side effect, created by the manipulation of
whatever those "u.f.o.'s" are made of.
It could be an explanation for the molecular changes they detected in weed wherever they found
crop circles and the other residues they found on alleged landing sites.
Note that is is possible to change the molecular structure of matter by extremely strong magnetic force.
Just think of what a material can do if all the particles of that material could be manipulated to behave
as just one single energy field.
One particular good example is the story of the philadelphia experiment, where the uss Eldridge
completely disappeared and at the same time appeared at Norfolk, Virginia over 200 miles away.
In this experiment there was an external force applied, made of a battery of generators that produced
a combination of pulsating and non pulsating magnetic fields.
But when we are ready to utilize the energy that is stored in all matter, we are also ready for
interstellar travel.

And I agree also that the term u.f.o. should not be used for things like flying saucers, because
once we identify something as a flying saucer, it is not an u.f.o. anymore (UNidentified Flying Object)
Here's a nutcracker for the philosophers ..... If an u.f.o. is IDENTIFIED as unidentified, is that
thing still an u.f.o.?
What a boeing 747 is for us, is a u.f.o. for people that have never seen an airplane before in their life.
In this case, your idea to describe the "u.f.o.'s" as "seeming physics-defier" is not good enough for me.
They only seem te defier the physics that we know of, so when we know the secret,
"seeming physics-defier" is not valid anymore.
Just because that we do not know about some physics laws, does not mean they don't exist.
"seeming physics-defier" sounds like that they violate our laws and understanding of physics, but they
just do, wich implicates that there are other physic laws that we don't know of ..... yet.
If those laws where not there, those things they can do would not work, simple as that.

But I do fully agree with you that N.A.S.A., the airforce, the C.I.A. and the shadow organisations
that deny their own existence should stop lying trough their teeth about this phenomena.
For what????
Just to prevent russia to have their own "u.f.o." and become a unbeatable enemy?
Have they forgot that Uri Gagarin was the first human in space?
America and Russia should work together on this instead of spending their energy in developing weapons
of mass destruction, because once we as a species found the way to travel trough time as the "aliens"
do, those weapons are pretty useless.