Paedophiles that act on their urges will never change because it's children they're attracted to.
Offering medical help is like gay conversion therapy. It doesn't work, because its not a life choice. However, pedophiles CAN make the choice not to devastate innocent children's lives. But some are completely selfish and have no self control. Some enjoy it because they know they're ruining lives. It's not always just about the sexual satisfaction. We have to keep in mind that people can be so much worse and a million times more diabolical than decent folk could ever imagine.
Personally I think the ones who act on their disgusting urges should be put down. Or put them on an uninhabited island and they can rot together. These are the worst in society imo and I have zero time, patience or empathy for them. I honestly couldn't care less what painful, torturous things happen to them. They disgust me beyond words and don't deserve to breathe air.
A paedophile who knows what they are, but actively avoids situations to be near children and would never want to harm a child, could indeed be helped somewhat with therapy, but it'll be a lifelong commitment and they'll still be paedophiles. That cannot be changed. I still wouldn't trust this type either.
Sterilisation is not the solution for the worst kinds because they will still have the ability to abuse children if they chose to.
With regards to parental neglect and having multiple children removed from your care, then yes, I believe in sterilisation. Let's stop bringing children into a life of misery and pain.