The US's national security interests in supporting Ukraine are pretty blindingly obvious. Turning isolationist and emboldening Russia helps no-one but Russia.
With fairness to these "emotional lunatics", their assumption that Russia would be too afraid to attack NATO territories has thus far been proven right.
As long as we are able to quibble about on the internets, ye, we haven't come to lobbing those around yet. Correct. Always a correct argument if it makes ot to the servers. At this point it hasn't happened...
Unfortunately for Russia, the "Final Warning" strategy has since been translated into English and is therefore ineffective against modern NATO regiments: https://en.wikipedia.org/wiki/China's_final_warning
America doesn't negotiate with terrorism, only strategic arms reduction. Russia cannot desire for nuclear war because it cannot be used as a bartering tool; ICBMs are merely an expensive pen for signing their own death warrant.