Yep, I'm mostly in agreement with you and am also hoping that the West does enable a sudden decisive victory. The best option would have been to nip it in the bud. Instead, Russia were given the space to landmine swathes of land, modernise their military tactics, and build an alliance with Iran and North Korea. And as you say the wrong kinds of people are winning here.
The only thing is, what happens next if the West pulls out? Ukraine's military collapses, Russia moves in on Kyiv, Putin gains another Belarus-like satellite state, and at least considers encroaching on Estonia, Finland etc... . It's more than just the principle of whether warmongering is acceptable - a lot of people will suffer as a consequence and possibly for decades to come. We have to be really careful to consider which is worse in the long-term.