It's not your idealism, it's your naivety. There's a difference.
You're not a murderer. You just believe in an ideology which empowers murderers and has always lead to mass murder when put into practice. There is a difference, to be sure, but you still don't come out smelling like roses.
It's not just the revolutions, bikerdruid. They stay bloody even after they come to power. And their "revolutions" never end.
I'm not sure how any nation can long survive in this world without blood on its hands eventually. That's not the relevant question. That you think it is is yet another sign of your naivety. The relevant question is not whether something is perfect, but whether it's the best we have available. And capitalism in one form or another is, by far, the best we have available. And yes, Europe (for example) is capitalist, though it's not a pure free market.
What, he envisioned them toiling away in backbreaking subsistence agriculture?
As always, you fail to distinguish between what you want and what is possible.
I really don't care what Marx and Engels envisioned. You can excuse their ignorance if you wish. They didn't know how things would turn out. But we do. And yet, even having all the evidence in front of you, you still cling to the delusion that communism is a good thing. That is not idealism, that is blindness.