Just because he didn't abuse Macaulay Culkin (that we know of) Doesn't mean he didn't abuse others...
This argument comes up a lot with MJ fans and actually I was just speaking to one on reddit who gave this argument but just because someone is a Pedo it doesn't mean they will abuse every kid they see or get alone smart ones will pick out certain kids they feel they can do things with and get away with it and also by slowly grooming them which we know MJ did with multiple other kids such as Wade, James and the Cascio family.
As someone who has been through CSA myself I will say that the person who chose me out also had access to my friends who was the same age as me and they solely chose me out so remember that.