By all accounts Heath was not a very nice man, but that does not make him a child molester.
I guess the question here, in relation to historic allegations of abuse, is whether it is right to investigate and come to conclusions even when the alleged perpetrator is dead.
Some think that because the person cannot defend themselves in a court of law that they must therefore be presumed innocent and that no investigation can be warranted.
Alternatively the the victims have a right to a form of justice, and while that cannot result in the perpetrator being convicted (as he or she is dead), a level of justice is served if an investigation concludes that they were a victim and in all likelihood a specific person was the perpetrator.
I err towards the latter view.