I like this comparison, it’s actually interesting to think about.
Pretty much everyone tends to agree with the scientifical consensus that climate change is coming, whether they are capitalist or communist. The only people who disagree are those who are financially invested in oil, gas, or coal.
In a similar manner, the message that “communism is bad” comes from capitalist regimes that have a financial interest in preserving the status quo. If you want to understand people within a capitalist society, a really good way to do it is simply to follow the money.
Towards the end, Marx actually expected Russia to go through a communist revolution, and that it may even be the start of the revolutionary wave in Europe. See the preface for the 1882 Russian edition of the Communist Manifesto for reference.