Earlier quoted context omitted.
"should kill people" = "those people aren't deserving to live" = 1) either all humans are not deserving to live or 2) those specific humans are not deserving to live = if 2) country X are being dehumanized. if 1) do you consider yourself a human? A) yes, then why haven't you killed yourself? Since you haven't you think you're more deserving of life relative to everyone else and therefore are dehumanizing everyone but…
According to this interpretation, arguments supporting capital punishment is hate speech and should be 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.