First, socialism is a symptom, not a system. A symptom that occurs even in the oligarchic implementation of capitalism we deploy today. A reason why our implementation of capitalism (not capitalism itself) has failed, by I digress.
The problem with socialism is that it leads to group-think which systematically shuns outliers instrumental in producing upstream innovation needed the escape the sub-priming of downstream.
Evolution relies on the value of our differences, not the rut of our commonalities. Hence socialism is the anti-catalyst to evolution.