Just the fact that people think the world is left/right, socialist/capitalist proves that these two allied ideologies have been extremely successful in the last century.

The logic that attributes those deaths to "capitalism" is lot more sketchy than the obvious fact that the deaths I attributed to communism were directly due to the actions of governments who explicitly declared themselves to be communists and who directly took the actions that resulted in the deaths with the explicit purpose of advancing communism. "Capitalism" isn't even a single philosophy, let alone one with an explicit manifesto that all the governments who killed all those people in the name of communism explicitly said they were following.

The problem is that it is normalized in western ideology to consider any death in communist countries as death by communism and any death in capitalist countries as explained by several other factors that do not relate with capitalism.

> "Capitalism" isn't even a single philosophy,

But I can say the same for communism. Or any other concept: there always will be differences in interpretations. And capitalists do not need an explicit manifesto because they are already the hegemonic power. They already succeeded in their past revolutions to give power to the bourgeoisie. The ideals for what they fought in the past are already normalized in the society.