Feel no shame about being light, because you can still be strong enough to throw a punch. If you can increase your speed or your mass, either will increase your power. Hence why flyweight boxers/MMA practitioners are still nails... You should do Martial Arts.
Also, my younger brother is 6'0'' and weights 50kg. He's pretty healthy, has a lot of energy, and is strong enough to wrestle with me, 30 kilos heavier.
A lot of systems are clearly going down at the moment; I find that interesting. I wonder which servers will be next. I also wonder who attacked the servers, could honestly be anyone. Anon basically represents all internet users, so who knows if the people behind it represent such a body. The anarcho-decentralised nature of such a group means that there's no way to track the cadres.
Poor choice of words, and really, not the most tactful thing to say, but America has a violent culture. Only thing is, so does every other nation. If he's just talking about guns, then yeah it's kinda heavy that mentals can get their hands on firearms.
On a more serious note, I think the best way to stay out of trouble is just to look nails. If you work out and look pretty sizable, people typically won't dare starting a fight with you because its not possible to tell how tough you are. If you're too small to look nails, then act like a fearless psychopath and they will run. I remember one time, out in my local town at night. 4 chavs were starting on a dude who you would probably describe as being something between a metal-head and a hippie. The dude just looked like a psychopath, took his shirt off and walked towards them, with a smile. The chav lads basically legged it, much to the amusement of me and my friends who saw the event.