Is it about great power struggle? Of course, undeniably it is. But built into that is supporting countries we find more common ground with regarding compatible values. Otherwise, what even is our raison d’être?
You cannot be serious.
Does this explain why the west supports Saudi Arabia, overthrew the elected Allende government in Chile for Pinochet, provides assistance to Egypt's military regime, funds military training in Bahrain, sells arms to Ethiopia, trains the military and sells arms to UAE and Yemen. The list goes on. No, it has little to do with compatible values, whatever they are in the context of a USA which actively seeks to deny voting rights to significant proportions of its population, it is all about geopolitical power.
As for the notion that the left somehow has a strangle hold on the idea that my enemy's enemy is my friend, gee, time to look at the West, most of the regimes and wars supported by the west are supported on the basis of keeping those the west opposes out of positions of power and influence, and who cares if our "friends" are dictatorial arseholes.
But, back on topic - given that the west is not going to confront China in the event of an invasion of Taiwan, and that given China is an emerging power in what is becoming a bi-polar world, what is your course of suggested action?
As for the Tasmania analogy, some months ago I suggested that this is how the Chinese would see the situation with Taiwan. Then, lo and behold, the Chinese ambassador comes out recently and makes the very same analogy. Seems I was right, they do see it like I said they would. You and I may not like this view of the situation, but that is the way the PRC views the Taiwan situation and it is always worth asking how things look from other perspectives.