The liberal status quo inevitably leads to fascism. This shit doesn't happen in Cuba, Vietnam, or China because they dont let capitalism stop them from addressing societal problems.

Society is constantly changing, yes. The problem is our institutions have not kept up.

A given institution (or complex of institutions) incentivize a certain set of behaviors. Not everyone adopts those behaviors, but enough do that the effect accumulates. Eventually something will break, some set of behavioral interactions start negatively interacting with the system (like, say, a for-profit healthcare system that incentivizes not treating the sick and wounded).

In a functioning system, this would be where you study what happened, and use what you've learned about the problem to try adapt the institution. This will create a new set of incentives for a new set of behaviors... and inevitably a new problem will grow out of it and the process starts over again.

I can't speak for other places, but in the US that is very much NOT what happens. Our status quo is stagnant. We've had the same problems for decades now. That is what creates fertile ground for fascism - when the guy saying, "We'll burn the rot and go back to when it was better" sounds more appealing than, "Nothing will fundamentally change".

Congrats, you've discovered Maoist continuous revolution theory.

So if “the status quo” inevitably leads to fascism, the only way to avoid fascism would be a society that is in constant change?

No, that doesn't follow at all from what I said. The present, declining status quo is leading towards people losing faith in it, and in the present conditions, the far right are the only ones capable of offering the convincing appearance of an alternative. Not every status quo is declining, in some cases, it may be possible to address such decline, and in other cases, the left is able to present a realistic alternative to both the right and the status quo, and so the rise of fascism would no longer be an inevitability - if there are more doors than door #2, people may pick another door.

Fascism, or things very much like it, happen whenever you let fear mongering powerhungry fools who deny reality in favor of some kind of nostalgia infused “greater” image of your society get away with their bullshit.

No, Fascism is not some random aberration, it is capitalism's rational solution the problem of the tendency of the rate of profit to fall. When there is no room for the economy to grow, society is divided into an gradually shrinking in group and an ever expanding out group, by seizing the assets of the out group and feeding them into the in group, artificial growth can be maintained, for a time. A more permanent and viable solution is to nationalize developed industries, removing the profit motive once it is no longer useful, that is, socialism.

This is the fundamental difference in worldviews between liberals and leftists regarding the present situation. Liberals see Trump and the alt-right as this sort of bizarre fluke that seemingly came out of nowhere, and may well return to nowhere just as spontaneously. Leftists actually study the material reasons that caused them to come into political relevance, and thereby understand that even if you cut the weeds, the roots are still there and will regrow, that the material reasons that created them in the first place must be addressed.