"Assuming a “dangerous felon” is also a convicted felon (right?), they can’t legally buy, possess or carry a firearm. If they circumvent the law, it’s still illegal."
I have a bit of difficulty with this. Is there a difference between a dangerous and a convicted felon? No. You're either a felon or you're not. You must agree with that, right? Therefore we have only two categories, felons and non-felons, or bad guys and good guys, right?
Hidden among the non-felons, otherwise known as the good guys, you've got the hidden criminals. I've expounded upon them plenty to not have to belabor the point here. The point is the obvious one. The more liberty and freedom we grant the "good guys" as far as lax gun laws go, the more liberty and freedom the hidden criminals enjoy. And they're every bit as dangerous as their already-convicted buddies.
That's why you "good guys," in order to be truly good guys, have to submit to common sense and reasonable gun control regulations.