The Senate voted 64-34 late Tuesday to debate a bipartisan gun violence bill, and its principal virtue is that it focuses on the source of too many mass shootings: young, troubled men.

The bill covers three main areas: money for states to implement so-called red-flag laws and beef up mental-health services; money for enhanced school safety; and additional scrutiny of gun buyers who are under the age of 21 or domestic abusers, as well as enhanced penalties for purchasing a gun as a straw buyer or trafficking in guns.