The problem here is that a griefer who is out to really ruin somebody's day can create a new Iron Man commander, and be on the lookout for badly wounded ships limping back to port, or a player engaged in a close fight. Suicide ramming inside a space station could also work.Hope it will be balanced.
Bounty hunters both PC and NPC have been named as the solution to griefing. Also the grouping mechanism.
To my mind this can never work as long as players are essentially immortal. The only outcome of that is that all players, griefers or not, over time, will all become elite and have uber iron 4rse ships. But I am willing to see how it pans out. Personally I will be playing Iron Man because I think this will be the universe I want. The players I encounter will have earned their ships, rating and cash by either being good enough to avoid the bounty hunters, in which case they are probably going to be better than me so the fight will be honorable even if they kill me. Statistics will favour the skilled and careful - I am ok with them being a threat, and the careless and unskilled will remain with low powered stuff and will not be such a threat.
Luckily the griefer will eventually end up in the griefer hell instancing, but in Iron Man they can actually kill somebody's character permanently. Even if it takes them many tries to do it, those starter sidewinders are free. It's even worse if it's a KS backer with access to an upgraded starter ship.