There seems to be this thing going on all over youtube between railfans and "railhaters". This guy is basically one of the former. However, all these KIDS are all high school age or less, and it's pretty much just school yard bulling over the internet. I got made fun of all the time by my peers for liking trains when I was in school. Now that I'm in college most people think it's cool (and they want to borrow my horns to piss off their neighbors, I just laugh and say no). Just like Stevie says, these "railhaters" people do it to piss others off. I highly doubt they actually represent a real security threat, and if they do, just remember they are kids, all they need is a good spanking/ass kicking if they do try anything.
Matt
Moscow ID