Collective action through widespread unity and organization. In other words, revolution. This method has successfully evolved society time and time again.
Occasionally, the present needs to be destroyed regardless. But it's really a final resort.
It seems to me that you've made the assumption that all revolution involves violence and purges of dissenters.
historically speaking, revolutions are a crapshoot.
forward looking, revolutions are a crapshoot (often sold by people not acquainted with history).