It's predominately scumbag v scumbag stuff, but it's also retaliatory vs 'normal people'.
The guy mowed down in front of his hotel by a drive by in retaliation for a fist fight earlier in the night.
Witness assassination has become a wider spread threat.
Neighbor pissed off about a parking dispute/mowing dispute goes off his rocker and does a sniper style attack (separate incidents, btw).
Domestic lie-in-wait attacks
That sort of thing.