Can Ukrainians not see they're being used as proxies? The US doesn't care how many Ukrainians die. The goal is to weaken Russia.

They are too busy trying to avoid being crushed by Russian tanks. They ask for the tools to defend themselves from unbridled and unjustified Russian aggression. The goal is to first stop and then kick the Russian thugs out of their country.
I'm all for giving them everything they need toward that aim, and assistance rebuilding their country once that is accomplished.