I'm not saying they're not committing war crimes. I'm saying the goal of the war is not extermination, since an extermination war would look very different. The war crimes are very similar to what the US did in their recent wars, like Iraq. So unless you think those were extermination campaigns, then that's not good evidence. You'd have to compare it to e.g. the Nazi's eastern campaign, which, again, looked very different. Where are the extermination camps? Where are the ghettos? Where are the death squads? Did the Nazis try to make every Pole get a regular German passport? The rhetoric of liberating their quasi-Russian brothers and sisters from Banderite ideology and Western vassaldom is also very different from the Nazi "Untermenschen" crap.
Whether or not "anxiety" justifies the war isn't important. We were talking about why they invaded, and they did this in the sincere belief that this was necessary to protect against a hostile military encirclement. This is not an unreasonable belief. The US would react similarly to such an encirclement, even if the other side repeatedly insists they don't have hostile intent. Even if there is actually no hostile intent (I doubt it), that's still not great, since plan and intent are subject to change. Who's going to guarantee that some future administration doesn't want to leverage the strategic advantage gained by parking an army and/or nukes near Moscow?
So this is what's called a provocation, and it suggests that the Russians aren't "mad" or irrational. They're behaving as expected by the theory of realpolitik. This would mean that this war could be deescalated by backing off and agreeing to a neutral Ukraine.
Edit: Russia invading Ukraine has therefore two main goals:
- Prevent Ukraine from becoming a NATO member. So long as Ukraine is in a war (or just a territorial dispute) with Russia, most NATO members will not want to admit Ukraine into NATO, since that could drag them into war with a nuclear power.
- Drive back the anti-Russian NATO-equipped Ukrainian army (quite a large force actually) from their core territories. This would give Russia a buffer to better absorb an attack from the territory of Ukraine (which is btw the direction both Hitler and Napoleon used to attack Russia). This also suggest that Russia is probably going to try to expand the buffer zone unless Ukraine gets demilitarized and neutralized (as in become neutral), if they can.
The goal is not to murder Ukrainians. And the primary goal is not to take territory, that just follows from the primary goal of creating a security buffer.