OP, thanks for persisting.
You are exactly right (and would be my expectations) that no, do I think they should actively do something? Maybe not but if there is a pattern of behavior (sounds like there was with a number of mailbox smashed and mailbox smashing is rarely isolated) and it happens enough, LE should begin to do “something”. Not just sit on their b*tts eating power rings (aka donuts :lol:)
My opinion comes from 17 years of volunteering for a sheriff’s office including 3 years “on the road” assisting deputies with things that didn’t really need a sworn officer (getting cattle off roads and taking cold/no suspect case reports). Been there, done that, shirt worn out a long time ago ).