Communism has never yielded a positive result.
It's economical plans are fundamentally incompatible with reality, its execution requires the centralization of power, and the subornement of individuals into the collective, with no room for dissent.
It's still objectively evil.
Yes, you are right, its only the Socialism that's bad in National Socialism.
That's not a cheap 'Nazis are left wing' jab - That's pointing out that Fascism is drawn from Socialism, and the disregard for the individual, and individual rights, is a thing they share.
Yes.
Again, Slavery was on the ropes in the UK before the revolution, The US constitution codified slavery into its constitution -
While the UK abolition movement scored it' first victory in 1772
So again, UK common law held it to be illegal in 1772 - and only four years later the colonies, in a fit of rage at being asked to pay money for their own defense, rebelled.
And wrote in Slavery as a part of their constitution.