How could someone as smart as Apollo..
be so stupid?
He was there to see first hand what could happen when you don't take your craft so seriously in Rocky's first fight against Clubber. Then he found a way to train and develop Rocky into the kind of fighter that can beat Clubber in a rematch.
In RIV, he forgot everything. Rocky at least went through the motions of training for his first fight against Clubber. Apollo did not train at all for Drago.
Apollo told Rocky that all Apollo could do was fight to satisfy his competitive drive. What about training other boxers? The reigning world champion was his protege.
He could have rode the success of the Rocky-Clubber rematch to train other boxers and teach them how to get the eye of the tiger. He could have written books, or become a boxing analyst on the sports shows. And none of those things require getting your head beat in.
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A dope trailer is no place for a kitty.