> Really? That's why they have vests that say "POLICE FEDERAL AGENT" front and back ?

The paramilitaries that executed Pretti are all wearing street clothing, and all wearing different clothing. They look like a mob.

> Dangerous people that could identify their faces and kill their families in retaliation.

Well that's convenient, because it also allows them to kill protestors or their families without any consequence.

> Why are the protesters assaulting them covering their faces

Pretti didn't assault them, and wasn't covering his face. He got executed anyway.