The main argument in favor of every patriot owning an AR, in addition to whatever other weapons he/she may have, is this:
In a SHTF situation, there is an enormous advantage to being in an organized group. And in an organized group, there is a big advantage to everyone having the same weapon, or at least weapons which fire the same cartridge. One other advantage of the AR is that it is easy to use for those of a slender build, which I don't think can be said of all the other alternatives. So ... if you don't have one, buy one, even if you have other (better) weapons. Assuming, of course, we may run into a SHTF situation.
So the question is, is America heading towards such a situation? I think there is plenty of evidence that it is ... that at least, it's a serious possibility. For those who have the time and inclination to read, I recommend
Megathreats, by N. Roubini, the guy who predicted the 2008 crash. It's not just about economics ... he identifies ten converging threats, which may lead to some serious collapse of the economic/social/political order.
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MegaThreats ]