Is communism the most lethal ideology in history?

I think the answer is no. Karl Marx said that agrarian societies should become capitalist and then develop into socialism. He believed in gradual transition with communism being an end goal.

Considering Russia, China, Vietnam, Cambodia and Cuba were all agrarian societies he would of told them to become capitalist first. Under Marxian theory they were not ready for socialism. Given that the first acts of these revolutionary governments went directly against the ideology they claimed to represent I don't feel that they can be blamed on communism. It is a bit like blaming democracy for Hitler.

People have used whatever ideology was popular as a vehicle to make themselves dictator for a long time. Whether it be communism, nationalism, republicanism or religion. These dictators never cared beyond a token effort about the ideology they used to get to their destination.

The ideolofy isn't lethal at all. If it worked it would actually be kinda nice - but it doesen't. It can not work because it's based on the wrong assumption that everyone is basically good - That all people would work and make sacrifices only for the good of the community.
What was lethal about it were the people that tried to enforce it and later the dictators that used it for their selfish ambitions. If you go with the body count, then maybe communism makes top of the list. But every ideology can become lethal in the hands of people who are greedy for power.

All systems fail.

the son killing a mother is the worst , buried with only her head free the men threw stones at her , with the son throwing the first, angry and happy at the same time , merciless murder of mother!! that shit's ugly man

I don't believe that the "idea" is lethal...or evil, and the concept sounds utopian, but falls prey to evil too easily.

Collectivism, including Communism, can never work in a free society since no two humans are alike.

The only way collectivism can be enforced, is by giving government tyrannical control.

There's a place where any of us can go to be guaranteed food, shelter, healthcare, and recreation. A place where only government officials bear arms. A place where safety is absolute...and closely monitored.

But...none of us wants to go to prison. Yet many among us lobby for that exact way of life on a national scale.

Communism may have it's disadvantages, but what system doesn't? Capitalism isn't perfect either. I must say I like certain aspects of communism, but communism as a whole goes too far. Therefor I concider myself a socialist.

Socialism does allow for private possession, it does allow (within limits) for income differences. With that, you take away the disadvantages of communism and what remains is a workable political system. It doesn't make people rich, but it doesn't make people poor either.

All systems fails since they work on favourtism. One favours those with money, one favours poor, one favours the ones on top who horde the money(Kings and Queens). We should not favour people. We have the right, the left but really none of these sides is more important. We need a balance and everyone needs help sometimes, everyone deserves to be treated fairly, and no one should be told they are more special since they are poor, rich, black, white, hispanic/latino, oriental. We should make a system that helps everyone equally but that kind of thing will not seem to happen.

True communism would indeed be a utopian system. But humans are flawed creatures; selfish, lazy and uncaring of the needs of others if those needs interfere with their desires. Just look at the rich republicans (like the Koch brothers) right now, trying to cut social security and medicaid; both of which are earned systems, not government "giveaway" programs.
I have lived in a "communist" society on a small Polynesian island which worked nearly perfectly, but there were only 67 people in the village. Three days a week I caught enough fish for all to eat with the other fishermen. Twice a week my wife baked the bread needed with the bakers. The people who grew veges gave their product to all and once a week an animal was slaughtered and everyone got their share. Old, young or in between; all contributed what they could and received their fair share.
"From each according to their abilities, to each according to their needs". Not a bad ideal, but it just won't work on a large scale.