You don't seem to understand how burden of proof works.
No one has to prove a man's innocence. MJ was unusual. But there again, why is it unusual for a man to take an interest in children? Just because we, culturally, have developed a self-imposed isolation between children and adults does not mean that anyone who goes against this is doing so for sexual exploitation.
What people must do is prove the man's guilt. That is often hard in a case of a sexual nature. I will, however, say that these people did not come out and file criminal cases. They filed civil cases and sought damages from his estate.
It is specifically this type of behavior that has led to a situation where society automatically begins to doubt people who make claims of rape/assault. People wait for years 'out of fear' - then magically have some crisis of conscience or receive some prompt from the media that "gives them the courage" to jump up and claim they were victims who need to be paid some kind of reparation.
Vultures and scavengers picking over the bones. Even if they were wronged in the past, they are not some variety of lion or guardian to be celebrated.