I'm gonna say yes, that's awful, but you shouldn't join the army. On one hand, (assuming all of the OP's posts are what he actually thinks) you should, simply because then you'd be removed from regular society, maybe far away to Afghanistan, and I wouldn't have to worry about running into you on the street. On the other hand, given Australian gun laws, you'd be hard pressed to fuck shit up with bullets over here and knife rampages are quite a bit tougher, so you'd do less damage. Probably. On the other hand (the weird shriveled third one), if you join the army and espouse this kind of horrible, anti-social rhetoric then kill a bunch of people, the headline will be "Violent trained monkeys in the army are violent!" and not "Video games make people kill people!"
Also, your later posts suggest an absurd lack of empathy, which I find pretty nasty, and moreover, if you reckon everything was better 100 years ago, how about you go write it out in a letter, be opressed by a classist, sexist, and racist society, and then, in the afternoon, die from polio. I don't know about you, but that sounds fun to me!