I am against doping in sports. Not only does it remove the integrity of the sport, but it can also be dangerous to the health of the athletes. If an athlete has been caught doping, they should be stripped of their awards for the event, and prevented from joining future events.
As for other unfair advantages, as long as they aren't using banned substances/practices, then it should be ok. I have read that Michael Phelps was pretty much built for swimming. His body produces less lactic acid compared to a regular person, and his body is more flexible, so he can swim faster. A recent athlete is the woman in boxing that has XY chromosomes. She has female genitalia, and was born a woman, but her body has the chromosomes that men have, making her have a muscular advantage. This is supposedly a rare condition, so one could argue that she was also built for strength sports.
But going back to doping, I heard that there is an event being planned where the organizers are going for a free for all route to see the limits of humans. Participants can use doping and other substances to get the best results. If it does become a reality, it will be interesting to see how their numbers stack up to the olympic/world records.
I hope they all die of overdoses.
I don't. I just hope they do it safely.