I have not idea if you have a point concerning the drydock pretaining to this story, so far I see no point.
As far as the man in the wheel chair, I think we are all smart enough to see who is a real case of the needy, and who is not. Unfortunately all the scammers seem to outnumber those who really are in need. Consequently, we have all developed a thick skin and very wary about just giving money to the panhandlers. Sounds to me like your veteran friend, just is exploiting his leg injury, and do you really know if he lost it in Viet Nam, or lost it due to something like a long life of alcohol abuse and diabetics? I'm not being unsympathetic to his loss of limb, but I also see endless numbers of cardboard signs held by some pathetic character that says "Veteran, God Bless You". All an act, and all by design to make you, the giver feel guilty if you don't give. Usually, its right where you will are forced to say NO, like freeway off ramp waiting for a green light, or loading your groceries into your car. If you friend is at the gate everyday, he probably has more money in his pocket on a daily basis than you do, wheel off to his car around the corner, puts on his prosthetic leg, and hops into the corvette.
I have no idea if I was "Had" or not, but in my case, i was convinced of real need. If they really need a meal, I'm ashamed I didn't really take them someplace to have something of a real sit down good meal. If they were scamming me, than I would think, every bite of what they ate, would make them think how they took the food out of someones mouth, who really did need a meal.
As for your injecting your own RISK of you own job making your money, and how you give, you are just full of baloney orangetom. We have covered this before, you are not alone handling nuclear fuel rods, by any means. You handle and move them with teams, and probably have more check points, inspections, and more conductor procedures, that are designed to completely be "Can't fail processes". No one single person is told, "Hey go on down to switch the rods out", and be careful. Your risks are little to none, you are exaggerating.