Not worried about it. The only gun I own is a Red Rider BB gun with a compass on the stock and a thing that tells time. In your scenario, an AR-15 isn't going to do anything other than kill a few brown shirts before they find a way to kill me and my entire family. Either way I am effed. I will have to trust that enough people in this country have enough common sense, morals, and empathy to prevent your doomsday scenario.
Okay, so you don't ever believe in a WTSHTF scenario. And if it does ever happen, you just give up. Fine. Don't force your choice on others.
You don't want me to force my belief that abortion is bad on you and take away your opportunity to choose and make that decision for yourself. I'd say the same applies here.
How many people are killed by abortion vs. semi-auto firearms?
I mean, it's all about saving the children, right?