If you want to avoid this, you could try informing the people about all the horrible things marxists have done,and all the problems with communism. Some will still believe in the dream
You could try talking to them about "The Gulag Archipelago", how absolute equality is a pipe dream, how communists don't like the poor (only hate the rich) and so on
The Gulag in that book was not a REAL Gulag, not how I would have run it at least. My Gulag would (re)educate and instill enlightened views and beliefs - the best kind, so sublime.