You might want to try to place it into context verus assuming you know what my point is. Power corrupts; absolute power corrupts absolutely. The common ground is corruption - and power. Not in attempting to find a middle ground in the discussion.
That makes the comment even more outrageous as you were not even trying to garner some level of agreement with the original anti-american poster.

I see no instance where any US president can be considered in the same vein as those dictators. That kind of rhetoric only promotes the kind of relativism that people like the original poster try and draw between America and such empires as the Nazis and Soviets.