we have to say "youre wrong" when people are wrong. something has to be done to prevent people from getting stuck in ruts of fascism or social reformism. the tool of choice is critique.
communist theory is already out there and available to whoever wishes to read it, but most people will never even think of looking for it unless they start by questioning the truth of their present worldview. critique is only one part of that, but it is an indispensable part.