How many teachers molest vs. how many homeschool parents?
How many teachers are serial offenders? How many parents are?
While the number of overall teachers who abuse may be a small percentage, the number of abuse cases may be significantly higher.
There are all sorts of child abuse. Parents who are going to abuse their children will find a way to do so, whether those kids are in public school or home schooled. If the kid goes to school, though, the parent will figure out a way to be sure that the abuse doesn't show.