I was having this conversation with my spouse and Mother-in-law today. I said I don't know what we can do. The horse has left the barn. We might just have to live with since our founding afathers were wise enough to write a totally ambiguous and contradictory Ammendment.
They favored the usual, Gun show loophole, assault weapons ban etc. And my favorite, "we gotta ndo something.". No, we have to do something that has a chance to help.
Probably the best argument I've heard on this thread is not publicising the name and manifesto and weapons used etc. They don't show people who run on a football field so as not to promote the bad behaviour after all.