The war has been going on for a bit more than a thousand days now.
Your points would have been valid maybe one year into the war. Unless you’re suggesting the US military industrial complex takes three years to respond.
Quick reminder that Russia first invaded Ukraine in 2014, before that they invaded Georgia and before that they took Chechnia. And yet even now the popular belief in the West is that the war in Ukraine will be the end of it and that some sort of a peace deal can hold.
One report from early in the first Trump administration (possibly apocryphal) was when Trump was being briefed about NATO commitments to defend all member countries. Trump supposedly was surprised that the US was committed to going to war with Russia if they invaded Latvia. The Baltic countries are very exposed and could be reached by land only through a narrow gap with Poland.