The alliance is capable of dealing with the bully, but it clearly prefers not to, and will probably say meh even if Ukraine gets totally destroyed. Which may cause some leaders in Ukraine, just as some already do in EU/America, think that maybe the whole nation building and bear poking on its doorstep wasn't worth it. But it is also possible that Russia won't be strong enough to keep this up and some stalemate will be reached. Time will tell.

Has it been worth the price for Ukraine, and the common people who paid it with their lives? Couldn't the same point be made regarding the US? Would every Iraqi be in favour of the West being the only military power on Earth?

A good place to note I fully condemn Russia for the invasion and loss of lives... I just don't find it surprising in the least and do think NATO expansion catalysed much preventable harm.

Ukraine did not join NATO, and it's not ok to draw a direct line between former Warsaw Pact countries joining NATO and the current war in Ukraine.

Also, as said you shouldn't say "NATO expansion". That's the imperialistic Russian viewpoint. NATO doesn't expand, countries join the alliance.

And I repeat that that's a very naive point of view. NATO absolutely expands and is aligned with a political point of view. I'm part of it and presumably so are you, but that doesn't give it magical properties. Ignoring NATO's historical context does no good.