Here is the thing as someone who has seen the effects of this sort of crime I can tell you that there are two problems with assuming that all charges like this are made up.
First it can be hard to find evidence that will stand up in court,the people who get away with this tend to be good at covering their tracks and doing these things in private so the matter is a reduced to a he said/she said sort of thing.
Two it isn't until recent years that police really started treated these cases as major crimes so in many cases they were not investgated to the extend say a murder would be.
Three unlike a lot of other crimes child molestation leaves a scare on the soul and leaves many children feeling like it was their fault,so they are afraid to come forward. These feelings may not be logical but they are there none the less and must be understood.
I have heard a lot of people who assume that just because it takes years or some times decades for the child to get to the point where they can talk about it to the police or anyone else that the charge must be made up,but that is not how this sort of crime works. In something like an armed robbery it is clear who the victim and who the crook is so people have no problem talking about that. Sadly most children are abused by someone they looked up to so they feel that it is their fault and that they someone tempted the molester into the actions he or she committed. Now I am not saying all charges like this are untrue I am just saying that in recent years there seems to be the assumption that all charges of this type are false and that the person being accused is a victim and the accuser is some sort of gold digging monster and I don't think it is ever as simple as that. i am sure there are cases but I am also sure that some of these charges that get dismissed out of hand are in fact true. Some crimes are just harder to prove in a court of law then others.
I am not sure what the point of this post was i just thought I should give the view from where I am stand having seen what this type of thing does to a person,that is all.