Because is largely exaggerated. All killing is immoral and I don't like utilitarian arguments myself but those dictatorships killed a fraction of the people than most think. Example, in Argentina where I was born, for decades it was believed that there where 30000 missing, but now the official number turns out to be a bit less 7000. Even people coming from the left-wing that, in an exemplary way did a self revision and lived their mature days trying to recover intellectual honesty have recognised that the 30K was a fabrication to amplify marxist propaganda https://vimeo.com/95210051

> Because is largely exaggerated

Exagerated what, the lie you wrote that only on Marxists regimes you can be persecuted?

the problem is that you see Mrxists even in the extreme right.

> All killing is immoral

It seems that not for you when youi minimize and deny anmy killing frok your side

Perhaps Videla was a hero for you, or Pinochet, or Stroessner.