People being alive longer, and more people being alive means you're going to notice more of these occurrences happening. It does not mean they are related. Furthermore, increasing life expectancy, health, and lowering the mortality rate is a good thing. People with disabilities, or people with a history of them in their families should have the right to live, rather than have that right taken from them because some nerd thinks they should be. Eugenics is an awful idea, full stop. Natural selection is not comparable, because it is not something decided by a being, it is decided by a force. Taking the human input out of eugenics doesn't suddenly make it natural selection. If anything, removing human intervention would make natural selection become a force of eugenics itself. Not only is your reasoning flawed, but eugenics as a whole is flawed to begin with. It is absolutely not the right of any one man, or group of men to determine if others have the right to live just because of their genetics.
So yeah, frankly? I think calling someone a, quote, "fucking monster" for advocating the extermination of those they deem unfit, or to abandon them and let them suffer alone (which is arguably more cruel than just outright exterminating them) is more than justified. As I'm sure you're well aware, I have plenty more fitting words for someone with such stances. There's a line between judging the state of someone's life, then making a decision based on mercy because of that, and the edgy as fuck stance of "lol fuck them bro just like survive and shit." Especially when those completely capable of survival will be squandered by events out of their control in society.
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This too. "perfect humans" would just lead to awful classism, which we really don't need more of.