The reasons for why MJ is the way he is are of course complicated and I'm sure the parental abuse part is only one aspect. Interesting to note the rest of the Jackson siblings, in particular Janet, seem to handle their adult lives in more normal-adjusted ways (though nobody is perfect and everyone has their problems). I just imagine him having to look at that massacred face every morning in the mirror for the rest of his life and knowing he will have to live with the consequences of his earlier decisions until his dying day. Heartbreaking!
I understand the argument that his plastic surgeries are a form of visual art like Amanda's, but in MJ one always has the sense that, where Amanda is creating something, MJ is running away from something. While Amanda seems to have a destination in mind when she gets something done, one never knows what strange driveway we'll turn onto when MJ gets more surgery. And in any case he just doesn't have her sense of style, pinache etc.