liberals will never understand:
1) electoral politics are optimal for incremental change. their purpose is to prevent radical deviation from the status quo. this is why, as useful as bernie & corbyn have been for de-stigmatizing the left, any truly leftist movements can't be voted into action.
2) to overturn capitalist systems, a people's revolution must come from the bottom and will be met with [violent] oppression. this is why leftist groups cannot rule out a militant aspect to their theory