I can tell who is young in these arguments and hasn't really experienced the world at large yet. I used to be rather liberally minded as well. Hell, back in 2008 you find posts of me in arguments supporting anti-racism and voting for Obama.
After that point is when I started traveling and interacting with people from cultures from all over the world. I've witnessed a lot of the hatred, evil, and Godlessness the world has to offer, and I know that is only scratching the surface of what is really out there.
I believe it is my duty to promote my beliefs and protect my friends, my family, and my homelands. Without hesitation I would kill 1000 "others" before letting one of my own kind die.