Doesn't matter really what FD do, gankers will find ways to gank, greiefers will find ways to grief, and other negative types will find ways to continue to ply their trade, which is mainly the harvesting of salty tears.
Look at EvE for an example, where people are willing to lose a lot of investment simply to blow someone up in a Concord protected part of space.
They don't care about their own loss as long as they cause someone else to lose something at the same time.
Its been stated many times in this thread how FD have provided options for people who do not wish to play alongside those people, specifically modes, block, and thanks to the large galaxy size, location (stay away from busy systems, you'll probably never see a ganker or other negative type).
The problem with threads like this and similar (open only threads) is they are done from the point of view that everyone has to play alongside the gankers and griefers and the devs should introduce mechanics to stop such behaviour, or in some cases, the devs shouldn't, because its all part of the game.
FD simply said don't wan't to play with such people, then you don't have to.
Some games solve it by providing PvE servers (although griefing can still exist, PvE griefing can be done if you get creative... and there can even be ways to PvE gank someone, through using the environment against someone).
EvE tries to do it via providing "safe" spaces, but as noted, it doesn't actually stop it, just probably reduces it a bit. And it has its equivalent of open only bonus as such spaces are usually less profitable. But such mechanics are a bad idea from the perspective of those who want to just play the game without the negative types of players.
Note: Before anyone says it, i'm not saying all PvP is negative and that all PvPers are negative players. Far from it, and you can have negative players who are negative through PvE. That could actually make an interesting discussion in itself, how negative PvEers are using the game mechanics to grief or otherwise annoy players through their PvE activities. I think a good example here were the UA bombers which were disliked by quite a lot of people.