McGrath... I'm sure, as you say, that 'sane' gun owners would agree... but in such cases, sane is itself ambiguous.
On issues like guns, abortion, immigration, LGBTQ rights...etc.. sanity is problematic.

I'd counter by asking why Britain and other countries can't stop football/soccer riots. Are those who crash gates and pick fights 'sane'?

Humans are distinguished by their ability to rationalize and ignore laws on certain topics... sadly, fascination with guns is the albatross WE are burdened with.