Divorced (without biblical cause), tax evaders, liars, adulterers, greedy, gluttonous, prideful, fornicators, etc...... They are all a-ok to be around kids. It is far more likely that those who fornicate will lead kids astray than a homosexual "turning" a kid homosexual. Most the population could never, ever choose to be gay if they were paid to do so. But being convinced fornication is perfectly ok is very easy to do. What about eating, or drinking alcohol to the point of gluttony? Very easy to convince someone that is ok to do.
Do we see threads saying single people who are living with a heterosexual partner should not be around children? Do we see threads on someone who drinks or eats to excess frequently should not be around children? From what I have seen it is only a tiny subset of folks people worry about. If people want to protect the kids from being lead astray, pick the most likely candidates, not the least likely.