Only looking at the last months before the EIP gives us several contenders for the first place. Bernie has a long history of supporting the community, and when haejin started his scheme he was one of the few trying to stop him. He was attacked a lot for that, and I assume at one point decided that it's not worth the trouble and he'll be better off doing the same. There were quite a few people who did work for the community before joining the farming scheme, as they didn't have the possibility to effectively fight it and didn't want to watch the abusers grow in power while they lose out for being honest.
I never supported this behaviour, and I'm happy to see that most of them, including bernie, changed their ways and support newsteem with honest curation and using their downvotes to go against abuse. Something that can't be said about haejin unfortunately.
Maybe freedom could take the first place too - his stake is higher than most of the others combined, and he solely uses it in ways that make profits for him, no community interaction at all.
It's hard to say for sure, and it depends a lot on perspective and what you actually consider abuse. Haejin doesn't see himself as an abuser at all pretty sure ;)