I'm not. I have no desire to reproduce and have kids of my own, but if somebody else has different views, that's perfectly fine. I hate some of my genes, they caused me a lot of harm, and I don't want to pass them on. That does mean I support eugenics and making it illegal to have kids if you have certain illnesses - I strongly recommend adopting in that case though. I considered adoption, but not if I'm alone. There are plenty of kids that need help already.
Let people live their lives the way they want to, as long as they are well informed and don't harm others (you could argue that bringing life is harmful, of course, that's the entire point of anti-natalism). I'm fine with bringing life to this world, but allow people to leave it if they want to (at a certain age, let's say 20 years old, and make sure they are not coered, bullied into, not dying to sell organs, you ask them every day for a year if they are sure, and so on).
"Why can't we all get along", it's really not that hard. There is middle ground for everything - expect for greed in terms on money, power, wars, lies, deliberate misinformation - that's literally the main cause of most issues in the world. There is no need to force your views on somebody else, we can literally live next to each other, and at worst just ignore each other. But there are people that are unwilling to do that and humanity needs to learn how to deal with that.