If Russia gets anything out of this war it would be anything but death minimising. It will signal to them, and all other states, that aggressive wars are viable. They are in Ukraine because war has worked out for them in Georgia and Chechnya. You are literally espousing a pro-imperialism stance masquerading as a moderate position.

Because it is dumb, insensitive to people losing their lives on the the front lines and makes it seem like Russia is _actually willing_ to get out of Ukraine if only it is allowed to keep Crimea, which it clearly is not?

Because Russia has been taking pieces of land from Ukraine since 2014. If you'd hand over more land to Russia now, they'd invade again in a couple of years, with their army stronger than it is now.

Besides that, appeasement has never worked against aggressors in the past. It basically looks like Musk is calling for another Munich Agreement. It shows a complete lack of understanding of history, and of international relations.

Why would you "throw a bone" to terrorists ?

That would be like saying "let's throw a bone to nazis and let them keep Poland"...

Because appeasement worked out so well!