It’s too soon to say whether President Biden’s response to the carnage in Tulsa, Uvalde and Buffalo (‘For God’s sake, do something!’), will result in legislation. But nobody with more than a passing interest in this perennial and peculiarly American problem would bet on it. Mass shootings are now such a staple of the US news cycle that condemning them has become a rite of presidential passage – like reprieving Thanksgiving turkeys.