“Prior to capitalism, the way people amassed great wealth was by looting, plundering and enslaving their fellow man. Capitalism made it possible to become wealthy by serving your fellow man.”
May I suggest that figuring out how to provide for the needs and wants of your neighbor in a voluntary transaction is of far higher morality than killing him, stealing his stuff, and selling off his wife and children into a lifetime of slavery?
If you want to compare capitalism and socialism then adjust the second option to just stealing his stuff and drop the killing and slavery part. The choice and the obvious answer is the same.