"Of course democracy is not incompatible with Communism. How could it be when the people are enthusiastic supporters of Communism?"

There were/are enthusiastic supporters for some of the worst causes.[1]

Also, historically, comunism did not support occidental democracy systems.[2]

[1]http://heavy.com/news/2016/07/new-isis-islamic-state-daesh-a...

[2] https://www.marxists.org/archive/trotsky/1918/xx/principles....