More than 99% of people reject Green parties, and instead keep voting for parties and politicians subsidizing a mass extinction. Would it be ethically correct for the 1% of people who don't want a mass extinction, to keep killing the omnicidal class - which the 98% will then find replacements for?

It's not just the richest 1% who are the problem - yes they cause vastly more harm than the rest, but it's also the other 98% poorest who vote for the most violent, Machiavellian, narcissists there are to rule them.