Taking a crack at your initial question, as I hope I'm not derailing this into a Pizzagate thread.....
I don't know if there's an "obsession" with pedophilia, more of a growing concern that it is being normalized (I hate that I used that word). So, left wing and liberal beliefs are that anybody can be in a relationship with anybody else they want, regardless of sex or creed. Gay marriage, Trans rights, polyamory, etc. I happen to be very much behind all of those things. I have no tolerance for religious right wing people who vote to keep gay marriage illegal.
But where the liberals go a little bit too far and lose me, is right around the point where right wing concerns actually begin to have merit. This whole issue of gender being a mindset, being able to "identify" as a different gender day to day, and demanding it not be questioned at all, etc. Within the last two years, we've seen a rise in young children being exploited, only now with the encouragement of the media. Netflix had a show about little boys crossdressing and twerking.
Many right wing conservatives are disgusted by gay marriage and anything LGBTQ for that matter. They're ass backwards on that and I don't agree at all. Two or more consenting adults should be able to enter any relationship they want together. But they feel the legalization of gay marriage is part of a decline in morals in this country and see pedophilia becoming mainstream as the next domino to fall. Being against gay marriage is stupid, but we should all be concerned about the sexual exploitation of young kids becoming mainstream.