If you are gasping at this abhorrently poor taste incident, I recommend you stay far, far away from city machine politics. And again, I am not convinced either way about the sender of the postcard.
"gasping" maybe.. receiving genuine death threats causes that reaction. The line "this is not a threat" is meaningless. The sender has sent the message:
- I agree & wish you & your family dead
- I know where you live
As far as I know, city machine politics stays short of DOX'ing and death threats.