Abolitionist wrote, "a rational/scientific approach towards minimizing suffering and maximizing happiness"
As a general goal I have no problem at all with this. My criticism is that this is a neverending process. There will never be a point where we achive perfection and that will be that. Suffering can and should be reduced but, I don't think it will ever be totally eliminated. I think change ensures that suffering might arise again in new, unexpected forms. If we solve the old problems, the solution creates new ones, forever.
I don't know exactly how to prove this. I suppose it's my creed but, I think that the universe is structured in such a way that novelty never ceases. There'll always be something new around the bend. Perfection, like infinity or eternity, is something to be strived for but never reached. The absolute elimination of all suffering implies a level of perfection--and stasis!-- that I don't think is attainable by finite beings, superhumanly intelligent or not.
That said, it may be possible to attain near perfect mental health for the homo sapiens brain but, this implies nothing about the mental health problems of superhumanly intelligent beings which are simply beyond our ken.
There might be an infinite heirarchy of intelligent creatures, each more intelligent than the creatures of previous levels. The creatures can quickly understand and solve the problems of less intelligent creatures (We can make life very good for ants for example.) but will find their own problems very difficult. They, in turn, are regarded with some pity and compassion by still more intelligent creatures.
As on Earth, so in Heaven--only there is no heaven, no paradise. It's just an infinite regress.
I arrived at this line of thinking after considering the implications of Godel's Incompleteness Theorem. Basically Godel implied that within any interesting (And "interesting" is not a trivial word to use here.) formalizable system, you can formulate statements that can't be proved within that system. You might be able to prove some of these statements but often you forced to create a new, grander system that includes the previous system as a subset. This process is open ended and endless because in the new system you can again make statements that the new system can't prove. It just goes on and on.
So if math means anything, I think that we are forced to accept that science will never be complete, that ethics will never be complete, that anything interesting based on logic will never be complete.
Anyway, that's where I'm coming from when contemplating the abolitionist project. Nice enough goal, I just don't think it will ever be finished.