Some people react better to substances - This is why it happens - For example mechanical doping is frowned upon by professional cyclists because it's a guaranteed success while chemical doping is dependent on an individual's response.If everybody cheats then there is no point in cheating as it does not give you an advantage.
The fact is some people do have ethics and do not cheat - but are cheated by competitors who do not have the same level of ethics. Do we need to protect moral people - or should we just allow and encourage AFL players to be pincushions for drug companies to experiment with?
In AFL what is the point in having a salary cap and draft (equalisation measures) if you allow some players to get away with taking PEDs which destroys equalisation. A no talent kid on PEDs may well; exceed performances of a superstar who morally cannot take them.
The game cannot work if its rules are not enforced. Or the rules need to change so PEDs are allowed and we let our kids become lab rats.