the only time i find griefing funny is when im out of mission, i never do it myself because im usually playing the game the way its mean to be played, free roam works the way it works because it was also meant to fool around in, but not when im in a mission, the amount of times i get griefed in missions is irrelevant, i believe there's no place for it in missions thus why it shouldn't be doable against players in missions. Not sure what is also classified as a arena shooter since the type of shooters i played are rather limited.
Also i dont understand the argument of "immersion" I play an enforcer, my duty is to kill or arrests criminals. Most enforcers probably killed more civillians than criminals through running them over, shooting them, getting caught in a crossfire, or maybe from vehicular explosions or nades or rockets, I also happen to see super models wearing high heels and surfing muscle cars at high speeds while being able to properly aim a rocket at such motions. What is there to feel immersed about? this game is fun but its also a clusterfock that i cant feel immersed in it over it.