The person you’re responding to may not believe those things, and may not want those things or think it’s possible or reasonable. Let them speak about it at least before assuming that group affiliation means those things.
FWIW I believe dehumanization is a horrendous thing, especially when aimed at relatively powerless minorities.
The people currently in power do believe and act on those things. Claiming they aren't the bad guys (and especially voting for them) demonstrates tacit acceptance of those beliefs and policies whether you like it or not. You don't get to support people who do bad things and claim you don't agree with the bad things.
FWIW I believe dehumanization is a horrendous thing, especially when aimed at relatively powerless minorities.