Extremists on the left, if they had their way, would have literally open borders, would have full-on discrimination of the majority demographic, would have quota systems in place enforcing "equality of outcome", and would make stating non-progressive views illegal.
Extremists on the right, if they had their way, would have literally completely closed borders, would have full-on discrimination of the minority demographic, would have systems in place that allow for discrimination of anyone, and would make stating negative things about Christianity illegal.
When people use Hitler or Stalin as some sort of comparison, it's ridiculous, we need to judge by what's actually CURRENTLY out there.