What exactly is your issue with Wikipedia?

It’s clear from the content of that article that they are willing to include information on capitalism’s role in atrocities, and cite anticapitalist sources. The “anticommuniat mass killings” article even shows they are willing to do pro-communist listicles. It’s clear to me that the wikipedia article creation and editing process itself does not prevent creating well-sourced pro-communist articles. Are you complaining that the users on wikipedia choose to organize the information in a way that’s more aligned with capitalist viewpoints? If so, yes, of course-- most people in the english-speaking world are capitalists, and will view issues in that light. They simply outnumber you and so it is more likely they will make an article. But there is nothing stopping you from making articles of your own or improving existing articles to include your perspective. If you want Wikipedia to be more accurate and think it’s missing info or organized incorrectly, you are free to edit it yourself. It seems really weird to blame Wikipedia for this when the issue is (1) inherent to being a platform filled with user-generated content and (2) something you are in a good position to solve if you chose to participate.