I think the problem is not the single opinion of one country but the world and its leaders combined.
Compare to the incident where the entire Russian team was disqualified from the Olympics, it creates an 'unfair' advantage for others while some might not benefit from them so much.

Legalizing drugs would probably have some detrimental ripple effects starting with; School, Sports, and even gambling.
Before you know it we'll all be betting on the team that takes the 'purest' enhancers.

Some things should be prescribed medically but opening the cages entirely is out of the question for a while.