No one unarmed was exterminated and no one say that will be exterminated. You're exaggerating. None of the unarmed people were harmed on purpose. Yes, there are crimes in war. And there are precedents when the perpetrators were arrested. Yes, some words about "existing" really don't sound nice and strange, but if you really want to figure all out, then you need to watch the original full speeches, rather than quotes selected by interested Western media. But Ukraine and West reaction is not adequate. Ukraine nationalis really comitted bloody crimes, even european court confirmed it(https://www.echr.coe.int/w/judgment-concerning-ukraine-2). Ukraine and the West could really fight for their territories without war by peaceful ways. Ukraine also had no plans to hold a referendum on joining NATO, although not all people who support the West and the European Union would support joining the NATO military alliance. No Russia will be able to hold the territories if the entire civilian population went on strike against it. Sorry if you're not interested in looking into this deeply and you can't be persuaded.
For one thing, when you invade a foreign country, "we're only killing people who are armed and trying to defend their homeland" doesn't make it any less of a crime.
But also, the civilians who got shot in Bucha, and countless others in similar situation, would very much disagree.