Safeguarding as a concept is something that everyone should be aware of. And not be restricted about voicing concerns, due to fears of being 'smeared'.
My issue is with out sourcing sex education. We don't outsource history lessons to holocaust deniers, or geography lessons to flat earthers.
If the entirety of sex education was included in the national curriculum, and not just some of it, there would be no need to outsource to people who turn out to be creeps and perverts.
You can't, of course, legislate against creeps and perverts infiltrating the system. But if everyone is learning the same thing, at the same time, there is far more scrutiny.