Some of the arguments for Stalin being worse than Hitler are weak and some are strong. I didn't say Stalin was worse than Hitler or vice versa, I'm quite sure they're both burning in hell, so either way.

In terms of the total number of deaths caused by Hitler (those he was directly responsible for) and the total caused by Stalin, Stalin was the greater evil. Also, Stalin was directly responsible for the deaths of millions upon millions of his people, and some may argue that this is worse than what Hitler did. Again I'm not saying that I'm one of these people I'm just saying that an argument could be made.

However, Stalin did fight with the Alies against Nazi Germany and the Soviet Union did suffer the most losses in WWII and in terms of the total number of deaths caused by Hitler (whether directly or as a result of the war) and the total number caused by Stalin, Hitler was the greater evil. It's very touchy to make arguments either way because very many people today have families who were affected in one way or another by the two men and when emotions get involved, rational discourse usually gets thrown out the window. Regardless, I don't believe that Stalin should be on a list of the top 10 modern world leaders. If it were a list of the top 10 most influential, important or significant modern world leaders, it would be a different matter.