That begins to sum up why they felt the steroid ban was valid in MMA now.
My stance is pretty much the same with any top-tier sport; It is reasonable to assume that regardless of amounts of talent, those at the top will all be using 'enhancers' as when a lot is at stake and your career depends on success (as in; winning), why would you risk underperforming*? Therefore, knowing everyone is using something, why single-out and scapegoat a few?
In the end, we all watch top sports because we want to see out of the ordinary performances, spectacles, things we or those around us would not easily do. Nobody wants to see fat slobs posing in a thong on stage, nobody wants to see sprinters run high 20's on the 100m, nobody wants to see a 120kg snatch and a 150 clean and jerk. Steroid-bashers are the worst kind of hypocrits.
Really, when an athlete makes the choice to compete at a top level, they know what it takes, they know what it involves. Personally I don't feel doctors or the general public should interfere in that regard. It's sad we have old-school boxers now walking around with braindamage, but it happens, that's what they choose. Unless a two-division league is set up for each and every professional sport, a drug-free and an open-class, I don't see any of these poor efforts to 'tackle' substance abuse prevail.
*Look at for example actors; When an actor is cast for a bodybuilding role, and he's expected to come in looking in tip-top shape, big, muscular, vascular, etc. do you really think they would pass-up the deal because they have moral-issues against using steroids? I'm sure there are some, but at the end of the day, it's their livelihood.