Or purged of the evil, can we do it without taking down evérything we know and is good? Or is the very fabric of our civilization so corrupted that it needs to burn?

Burn it down. Then rebuild, no federal anything states only = small gov decentralized enough to protect from most corruption (federal)

It needs to burn, it is not salvageable. I don't think a system collapse has to affect the population nearly as much as people think. The government takes way, way more than it gives, why would removing a parasite be so bad?