I'd link to a bunch of steroid users from this era and say "Does this guy look roided up?", like
this guy, as well, except I'm too lazy to. The point is you absolutely cannot make any judgment of steroid use simply by looking at a person.
Whose to say that Aaron, Johnson, and Evans didn't have their own strict exercise regimes? Just because weight-training wasn't widely accepted doesn't mean that there weren't players doing it.
Speculating on whether or not someone did steroids based on power spikes, though, is ridiculous as well, just like speculating based on physical appearance is.
But, to get back to this point:
So, simply using steroids isn't bad. Using steroids and doing what every other athlete of your time in every sport does (work out) is bad?