On the other hand, if we must follow this absurd logic, we could be afraid that the USA will bring back the Slavery into the world. Were not ancient democratic Greece and democratic Rome based on slavery after all? Were not Slavery rampant in the USA still in 19th century?
In my opinion, it is not possible to enter into the same river twice. And it would be much better to worry about the real problems, - the global pollution, mass unemployment, the life extinction on the planet, etc. But not the ridiculous ghosts of the past.