Earlier quoted context omitted.
There isn't anything intrinsically wrong with communism as an ideal. All of its implementations, however, have been seriously lacking, and perhaps it is unviable in practice; this does not mean the concept is unacceptable in theory.
There isn't anything intrinsically wrong with communism as an ideal. There clearly is. Everywhere it has been tried, it led to at least poverty and usually genocide. Communism has been far, far worse than nazism or fascism and holding national socialism as some sort of valuable ideal untainted by the reality is unacceptable almost everywhere. https://en.wikipedia.org/wiki/The_Black_Book_of_Communism
Fascism is quite similar, though I'm not sure one could say communism is worse than fascism, given that the latter was only tried a couple of times and was put out relatively quickly, while the impact of the former happened over a much longer period of time and under much larger populations.