No one was teaching this. It was a book in a library.
"think of the children" is just the vehicle bigotry. Notice he isn't complaining about straight hook-up apps.
You don't need a need a book to use to these apps and I have strong doubts children are queuing at libraries to read them.
Homosexuality is just really disgusting to a lot of people who don't want their children exposed to it. If you also have to remove books about Tinder so gays don't feel singled out, you can do that too.
The rest are a diverse un-hirable band of racists, anti vaxxers and people that fake injuries for money.
I'm not at all conservative but i can see not all conservatives are like this. This is a recent phenomenon.