Every country thinks that the "market doesn't know best" up to some point. It is that (non-binary) point that should be argued about, not wether that thinking happens or not.
If I got your message correctly, you grew up in a communist country. Yes, those are horrible. But unregulated capitalism isn't any good either.
I didn't say that we should have unregulated capitalism, I just want for us not to throw the baby out with the bathwater when discussing about markets. History has proved that markets are indeed better than State control over economy, there's nothing binary about this. Also, look at Lenin's NEP (https://en.wikipedia.org/wiki/New_Economic_Policy), even the guy that invented modern communism came to realize later in his life that maybe markets are not that bad. That's because Lenin was a pragmatism by definition, not an ideologist.
Well, Marx himself believed that Capitalism and its markets had to evolve to a sufficiently advanced and truly technical state in order for Communism to be possible. And there was no explicit supposition that markets themselves should be abolished, which he viewed as one of the most creative forces in human history.
The problem for the early revolutionaries is that they either ignored or mistook these preconditions, and relied on authoritarianism to try and "hasten history." This obviously didn't work.
If I got your message correctly, you grew up in a communist country. Yes, those are horrible. But unregulated capitalism isn't any good either.