Possibly because ive seen that 99% of cheat accusations are actually wrong, ive only ever seen 2 cheats on tf2 and both were because i heard someone was cheating on a server so i went to go and have a look, never just happened to bump in to one and i have played tf2 a LOT. Been called a cheat in tf2 many a time too so you get the picture.
Just how do you hear about these hackers? Most people just move servers if they suspect a hacker, they don't go posting about them straight away or get on MSN telling everyone. Tbh, I think you are making stuff up in order to provide your side of the arguement with some substance!
I have been playing online games for years and years, you do get hackers, its a fact of life.
I have been accused several times of hacking, even banned once. I am a very good player (apart from CSS) on the whole, some days I will play amazingly and others I just can't get into the game properly and bounce from server to server and then just quit the game.
It is obvious if someone is cheating, especially to someone with half a brain. Yes, most accused cheats are just very good players but you do get those that have to cheat in order to give their lives some meaning!