The whole ‘dope, serve 4 years then come back’ suggests that being able to support yourself during the ban, whilst maintaining the level you need to be able to compete and then return at a level that is competitive whilst facing much more scrutiny (and, I imagine, outright hostility from some) is no mean feat.
I would suggest that it is incredibly difficult, and (as I have said before, more than once) having someone who has done just that standing up and saying ‘I did this, then to get back I had to do this, on the way I lost this’ is better than just writing them off.
The one strike approach that some suggest would be stupid. What if it’s a young rider, first pro level team, pressurised into it by whatever means and by whoever?
People make mistakes.