I completely agree that sometimes fighting is the right thing to do, but I'm not convinced we're at that point. Once we start shooting and Putin starts shooting back, there's a very real threat of World War III, and while I'm sympathetic to comparisons with Czechoslovakia, nuclear weapons significantly increase the ante. Even short of a nuclear exchange, I'm not at all sure we and Western Europe have the will to match Putin. If not, engaging would likely leave us worse off, not better off. At the very least, a shooting war would make Ukraine a much less pleasant place to be than it is now, regardless of who wins.