The person reporting has no problem with fetishes and wouldn't think that someone should not work with the vulnerable simply due to being kinky, she was just angry and wanted to hurt her exes new partner and presumably her ex, too.
Thats a worry. At least she ended up doing the right thing even if it was for questionable reasons.
You have switched to referring to the children she taught as ‘the vulnerable’. We need to remember that while children are indeed vulnerable, the fact that they are children should be foremost and the key driver of moral and ethical standards among the staff.
I think lots of people are into weird and wonderful things and manage not to let it influence their professional conduct. I do think one should be mindful when they work with children and said children could find them on the Internet indulging in their kink, but that's about it. I think we are allowed a (sex) life outside of work. Even an "extroverted" one.
This isn’t about ‘having a sex life’ - this is about indulging your transgressive sexual practices in the public sphere. Many people with fetishes need to push the boundaries to maintain a thrill. If those boundaries are weak, the behaviour can escalate.
As I said, there is precisely zero benefit to children to have a teacher with these faulty moral standards but it could introduce a significant risk. Why would you argue to introduce risk of sexual harm to children? Even if you think it is low, it is still increased risk over someone with normal morals and privacy boundaries.
Bring back the days when it was frowned upon for teachers to display their sexual fetishes in public and we didn’t get people defending it.