Reasonable and educated people in the US should be more critical of their own government which wages wars all around the world. China isn't a saint either but let's be real.
Gender imbalance on it's own doesn't say everything. You should actually talk with women in STEM. Many of them shared their horrible experiences so far.
Marx never specified how “country-wide implementation” should look like, Marxism-Leninism was the most common one. Escaping capitalism in today's world is impossible because the moment you decide to work on different economic model and distance yourself from IMF you'll sign your death sentence. Big players will never allow that.
You don't do manual memory management in Rust either. AFAIK (correct me if I'm wrong), even in C++ manual memory management is discouraged in favor of RAII.