Being ethical was neither the main catalyst/competitive edge nor the implication of capitalism. You stay on top in a capitalistic market by being competitive, not by being ethical.

Whoever taught you that pro-capitalism ideals in high school was just as delusional as the person who taught me the pro-socialism ideals in high school -- if not more. At least I believe most people who recite all the pro-socialism ideals in socialist countries are well aware that they are bullshit but just doing it for the money and safety.