The Dibaba accusation is fine and well-deserved. Let's leave Marc Scott (he left Bowerman shortly after a single one of their athletes got popped -- I think Shelby is likely guilty but the substance is more in the Chris Froome category than Lance Armstrong) and Salpeter (who started her career extremely late, explaining rapid improvement) out of it, maybe?
I think once you associate with someone like Jama Aden, or your coach gets popped for legitimate doping (e.g. not Salazar putting testosterone cream on his kids, which is f'ed up but something other than EPO-esque drugs) you deserve the skepticism. For the good of enjoying the sport, can we leave the people that haven't had credible allegations made out of it?