These interpretations can also be flipped around. One could argue that not supporting capital punishment dehumanizes murder victims and their families. Then some tough on crime politician gets elected and speech against capital punishment is banned.

Remember that whenever you create a tool to silence people, you are building a weapon that can be used against yourself. As recent elections have shown, sane politicians aren't always in power. The only long term solution is to build a system that works even when your enemies are in charge.

I'm ok with that.

Then you have such an extremely non-mainstream definition of hate speech that it was borderline intellectually dishonest of you not to come out with that example from the beginning.

Even in Europe, which has much stricter bans on hate speech and xenophobia than the US does, and where capital punishment is banned, claiming capital punishment should be unbanned is legal.