Which is why it must be stopped. I think poor Carlos situation arose from being sexually abused by his Master, and the White Council wilfully ignoring it.
Most powerful wizards are a few centuries old. Now if a boy or girl is sexually abused we take it seriously, at least where I live. But the scandals of the past could continue for so long because people did think differently. They did not take the children's testimonies seriously and were easily cowed by people with authority.
The older wizards would not take these things as serious as we do and might think it more important to protect the wizard than the apprentice.