I have never been witness to a UFO but I have pretty much been fascinated by them since i was a little kid. I ask sceptics, do they have to be aliens? IMO Ufology and the belief in aliens are to different subjects. With all the video evidence over the years you cant dismiss the fact there is some phenomena occuring in our skies. Is it man made? possably. Is it aliens? possably.
Skeptics always want to point out how advanced these aliens are compared to us. They say things like it would take to long to travel through space to get here, or like you mentioned how can they crash. I just say why not? Do they have to be from another galaxy? What if they are native of earth and have always lived underground? If you are interested in the subject do some research, read some books. watch some youtube.. UFOtv has some cool films on there and some that are specific to video evidence that you say is lacking. I dont know what is going on up there but all i know is that it is unwise to ignore it, im not convinced what ever is going on up there is looking out for our best interests.