How many mass shootings will it take?

This is a serious question. How many mass shootings will it take to break out of the long established cycle: mass shooting - hand wringing - platitudes - finger pointing - demonstrations - flowers, balloons, teddy bears on the side walk -... - waiting for the next one.

Would one a day do it? We are almost there already. How about one each hour on the average?

I predict that at one point people will stay home as much as possible, locking their doors, ordering in everything they need and refusing to go out unless absolutely necessary. I bet there are millions already doing that. Americans going to the mattresses.

Still, no action, not even keeping submachine-like guns out of the hands of mentally unbalanced people.

Would a sane alien, looking down at us from space, conclude that our species is not viable, maybe ripe for demolition as Douglas Adams imagined it?