Yes, but if you committed professional misconduct in another walk of life (say for example a teacher sleeping with a student, or a doctor doing something really serious), wouldn't they be out of a job too? Without a second chance? Is the issue not that meet organisers can't exclude dopers, because it's not the rules of the sport? And if they can't ban for life, can they change the rules so that the ban is for a stupidly long time, like 15 years or something?
I think it's funny that countries can not pick athletes based on age, perceived ability etc, but not because they're a previous doper. I even think that someone like Dwain Chambers gets into the British team because he's a doper (they're afraid to not select him), but they can skip over other athletes because they have no previous international experience (i.e. are too old; 2010 senior men's team for world cross springs to mind), or because they are not a potential top six finisher (men's 1500m at this yrs European indoors). Chambers didn't automatically qualify for the Euro Indoors, or the Olympics, so they didn't have to send him, but they did. Oh ya, I forgot, that's because he's such a nice guy and an inspiration to the children.....