If the only alternative to World War 3 is to allow Putin to invade whatever country he likes, then World War 3 has already started. It only takes one side to start a war.
You still looking at small part of the picture. Big part of the picture is confrontation of Western World and allies against China, Russia, Iran. The winning strategy could be to weaken enemy now: strike on Russia military/oil infra, and not wait until they will become stronger and will be way more bold in their moves which could lead to WW3 with much higher chance.
That's what concerns me. The Kremlin knows those missiles are useless without the US giving targeting information. We're delivering the missiles, setting them up, pointing them in the right direction, and then telling them "You push this button to fire it -- we didn't do it, you did."
But hey, I guess I'm an asshole for not wanting my homeland to be directly attacked because of the overt and manifest assistance we are providing to kill Russians in Russia.
