Probably Morbad does not see this answer as I think he has blocked me on forums. But nevertheless, I do consider blocking gankers as a public service, but more as editing errors in universe away from my game experience. If side effect is ruining gankers instancing well I do not shed any tears over that.
I think a lot of players feel the same way, and FDev did change blocking from being primarily only chat to more effectively preventing the likelihood of instancing with the blocked player, and I do agree that if a player (ganker type or whatever) is complaining about blocking the solution (as I see it) is to not be, or associate with, the kind of player others would block.
Nevertheless my block list is empty and several of the most interesting Cmdrs I have met have been very much the type I could see others might block, and the kind of players that use block that I have met come across as ones I would not miss if I never instanced with them again. YMMV.