So, I'm of several minds on this - one, well-regulated would mean that its perfectly find to regulate the ownership of guns, just not to take them away entirely;
two, the fact of when this new interpretation happened, after gun manufacturers had taken over the NRA [or maybe during], makes the current interpretation suspect; three, now is probably not the time to limit ownership of guns since we're in the beginnings of a civil war, and I'd be happier with more folks on our side being armed with ranged weapons too.
Also, the fact that people with medical marijuana cards are unable to do background checks to get guns says a lot - they don't want hippies having guns, only psychotic white conservatives, combined with the fact that Fascists tend to take guns away and it feels like, right now, they are trying to make non-fascists do their dirty work to further rile their base.