can I suggest that you go to your local college ethics department and ask for a refresher on basic logic. then go to their history department and ask for a refresher on the American Constitution and the Bill of Rights.
1. your coach says that a person should be considered innocent until proven guilty, and you think this is, "retarded."
your right to be presumed innocent until you have been proven guilty is perhaps the most fundamental concept of a civilised society. without this, you can, quite literally, be sent to jail without even knowing what you have been accused of. you can be imprisoned without any opportunity to defend yourself. is this seriously the sort of country you want to live in?
2. you think that Hicham El Guerrouj, Paula Radcliffe, Kenenisa Bekele and a host of people you choose to lump under "etc" because you are too lazy to list them are guilty just because doping cases only got discovered by "house raids and tests are rather useless." so you have never read a newspaper, never heard of drugs cheat Ben Johnson, or the drugs cheat Marion Jones, or the cheating liar Maria Sharapova, or the drugs cheat Diego Maradona, or the drugs cheat Asbel Kiprop, you've never looked at the long list of athletes who got caught cheating by tests both in and out of competition and yet, despite your massive and deliberate ignorance on this topic you call your coach, "retarded" for upholding a sacred right that folk have quite literally died to protect.
you should be ashamed of yourself.
https://en.wikipedia.org/wiki/List_of_doping_cases_in_athletics