Simple, because the democrat party for example has a long, long history of dehumanizing people. I mean they had no problem with slavery, founded the KKK, even in 1964 were still saying that black Americans do not deserve civil rights. That sort of evil, that has existed for so long, does not just disappear. The sort of scumbags that can look at their fellow man and see nothing more than something to exploit, of course they are gonna look at kids the same way.

This is why, even though I am not at all religious, I have come to believe that virtues like compassion, empathy, seeing each other as equals, believing that everyone has the right to their own opinion and the right to speak said opinion, the right to defend themselves, all come from our Judaeo-Christian society. I don't like the church but its pretty obvious that when left to our own devices, people are not inherently good, we are selfish fucking monsters.

The democrats, having never seen other people as real people and having no values see nothing wrong with rape, murder, slavery etc. They are a bunch of tribal scumbags who legitimately think they are better than everyone else, they think they are the elites of the world, and once you get in that mindset, who cares what happens to some lower caste brat.

And it has been this way all through our history, sure its still blatantly obvious in societies like the Chinese, India, Islamic countries, even Jewish communities hence the whole Nazi counter. But it goes right back with even the Romans having no problem abusing lower caste slaves.

TLDR: Judaeo-Christian values taught us better, the left are godless sons of whores who think they are better than everyone so see no problem with sating their desires with kids.