Poor logical argument.
There are many factors contributing to who gets brass at international sporting events. Moldova is smaller in population ...yet took home 2 weightlifting bronze medals, 2 more than New Zealand. Factors include cultural outlook, political national style (the more liberal a nation is, the less brass they gain. Communist Russia, china, north korea, Bulgaria...). Other factors include geographical climate, hosting the event, tradition. Tradition? Its tradition for Aus to do swimming and so forth so much effort goes into that development. The wealth of the nation is also a big factor.
Drugs help....but isn't a defying factor, since if 6 competitors are in a race and 4 of them have used PED, its the other variables that will determine the winner.