This is so true, it is tricy to make these kind of systems, as what might be obvious to you me to be griefing behviour is quite alot trickier to code. and if we need to rely on on human watching replay of encounters, then that costs money to staff these people, and that it could take days for FDEv to act on these reports.The thing about systems made to eliminate griefers is that griefers can often use them to do their griefing.
Put together a little griefing team, go to a popular hazrez and try to constantly occupy the space between players and their targets. Get them to shoot you enough that it triggers their pvp flag. Flag up and go kill them. PvE flag defeated. Add in your little punitive "now you can't pve ever again" and someone's entire elite experience is permanently ruined. This is not a good design.
And what some considers griefing is just normal gameplay to others.