You realize close to 70% of fighters use peds, they have already established a precedent for ped use if they banned him it would most likely just get overturned in a lawsuit.
Where is your source? What are you basing this off? A few interviews with some bitter fighters claiming that every other fighter is on steroids? It's not credible.
Even if the figures are actually overwhelming, that still doesn't mean it's right. Just because some thing is the norm doesn't render it acceptable. MMA judging is a shambles at the moment, doesn't mean we should accept it. It's wrong and fighters should be severely punished if caught.
That would not be a good thing for a whole lot of reasons. To take someone's livelihood away from them when many others have been caught doing the same thing and only got fines and suspensions. Not to mention that the first person they ban for this is a minority. I could just imagine the excrement storm that would ensue, and it would be justified IMO.
It's their fault. These are grown men and women, adults that should take full responsibility for their actions. If they choose to take performance enhancing drugs to give themselves an unfair advantage over their opponents then they should be punished appropriately. And in my opinion, a permanent ban is appropriate.
If the UFC want to cut down on the number of steroid users in the sport, then they should look to make an example out a high profile fighter. If any one gets caught using PED's then they should be banished from the sport or the organisation. I'm sure that would make fighters think twice about ever using them.
At the end of the day this is mixed martial arts, the best fighter should win the competition. Using PED's to gain unfair advantages goes against everything I watch this and other sports for. Everyone should be on an even playing field.