I have diagnosed ADHD, and as someone with ADHD, I'd rather not trick people into thinking they can live like everyone else, only to have others bully them for something they have no control over.

I didn't suggest actually killing anyone. If people could handle ADHD/ASD, then maybe I would be fine with more ADHD/ASD people being made, but it is just asking for them to be bullied and rejected in this world. I strongly disagree with the idea that disease makes people unique, and that parents should make kids with say, sickle cell anemia or down syndrome, cursing them their whole life to a disadvantage that they could never consent to. We have embryo testing and selection.

It really does not matter how we profess to think about human life, if we keep treating it like a commodity. Realistically, because of the way our species choose to be, things will only get better long after most, or all of us are dead. The more of us there are, the more your employeer could say, just find another worker, the easier it is for a friend to cut you off casually out of convenience, the easier it is a society in general to apply laissez-faire rules to its society. When we were just tribes, every single person counted, and they would die to defend each other. You had to evaluate if it was really worth being enemies with someone, as everyone was invaluable.

Yes our population will outright crater over time anyway, even if we do our best to keep everyone alive, which certain billionaires are fighting hard against.

Now, about being a fascist, you hear something that sounds like eugenics, and of course, you react in disgust without thinking. This is just because eugenics is usually used as a pseudoscience to persecute certain people. I don't really care about race, ethnicity, or the genetic status of the already living (unless they want to CRISPR themselves somehow). I'm more about making it harder for people to be vulnerable and exploited, since most of my worldview is explicitly based on anti-trust. I assume most people aren't good, reasonable, or capable. Of course I would do anything, even the unthinkable in order to make it harder for people to exploit each other.