I may not agree with communism, but I do respect your point of view and I can see where you are coming from. Marx does make some really good points, and I don't necessarily think communism is inherently evil.
The road to hell is paved with good intentions, and great evil can be committed in the name of the greater good. It is not necessarily communism I concerned about, but zealotry. To me zealotry is the enemy of reason when people believe in an ideology so strongly that they shut out all other points of view and to the extreme kill and destroy all dissenters. From what I've seen of communism, this is what happens quite often in one of these revolutions. (I know I'm not going to change your mind, nor is this my intent.)
However, when talking about these things I think people often confuse a system of economics with a system of government. How things are handled economically does not necessarily have to define what government is running in a nation.