Gosh, Claymore, what on Earth makes you think that only rightwingers and conservatives would be appalled by the atrocities perpetrated by China at Tiananmen Square, or by Pol Pot in Cambodia? Or China in Tibet? Or any number of other examples? I am appalled by atrocities regardless of whether it is a right wing or a left wing government which commits them...and I am what you would call a leftist, to say the least.
Gimme a break.
You make the usual facile assumption that all people of any opposing political viewpoint to your own on any substantive issue must be "fools", to use your term.
I make no such mistake when assessing conservatives. Some of them are very bright people, and deserving of respect.
Of course, you can be very bright and still sometimes be mistaken...with regard to some particular matter.
I think you would find many leftists in agreement with you on a variety of issues, while disagreeing with you on others...so don't be so hasty as to dismiss all leftists as "fools". That is just really lazy thinking on your part. In fact, it sounds kind of like unconscious bigotry to me.
I regard both the political left and the political right as having failed humanity miserably at this point in history. Mainly because they have wasted their talents and energies in fighting each other, instead of finding common ground. Their victims fill the graves of places like Cambodia, Vietnam, and Guatemala.