Comment by solidsnack9000

These differences are real but most probably don't make the difference you expect.

For example, concealed carry holders in the USA (about 5% of adults) are much less likely than the general population to be involved in a crime of any kind, and much less likely to be involved in a shooting.

Fully automatic weapons in the US are certainly more widespread than in other countries, and there are even privately owned artillery pieces and grenade launchers; but these weapons are never used to kill anyone. Eliminating or regulating them further serves no public safety purpose at all.