As you say, millions of Israelis (and the Jewish diaspora) don't support these people.
... but, parts of the Israeli government do.
So how should responsibility/blame be apportioned in a democracy with a vocal opposition minority?
I don't know. But it'd be a useful answer for every other country with voting in the world too (US, UK, Russia, etc).
You're going down a dark road when you start trying to hold individuals personally accountable for what their government does.
The reality is the US plays the heavy while all the other countries get to have their cake and eat it too. They can vote endlessly against Israel knowing the US will be the single no vote. Which suits them just fine. There is no brink of Armageddon because no one that is anyone cares about the Palestinians in Gaza and despite their protects they are perfectly happy with Israel exterminating Hamas. Because if you're a political leader you instinctively understand Hamas is bad news.
Also you're ignoring that while unlike you, Jews in the US don't support genocide against Jews in Israel. They are more critical and willing to apply pressure than say Evangelical Christians, your politicians and your business leaders. So you're mostly blaming the wrong people because it conveniently avoids pointing a finger back at you.