Too many variables for the poll to cover the necessary options. If I HAVE to choose one option in the poll, I think “always off” and “off in public matches” are the most viable options, because friendly fire with randoms instead of coordinated teams is just a bad combination.
Realistically though, some weapons should have friendly fire and others shouldn’t, and the specifics should vary between public and clan matches.
Persistent damaging effects shouldn’t have friendly fire - using Brink as an example, turrets and caltrops. Adding Friendly Fire to those would ruin them.