The way the tour organisers have stopped Astana from participating in this year's TDF is quite ridiculous especially since Cofidis are still allowed to take part.
However drug taking to enhance sporting proformance in cycling (or any other sport) is only to prevelant these days and is a really serious issue that must be stamped out regardless.
To use another sport as an example, if you could imagine for one moment what kind of impact this could have with two tennis professionals one of whom is taking a banned substance to enhance his sporting proformance enabling him to win the final - it would cause a public outcry and people would be up in arms calling for the drug-cheat to be banned.
That said I do not agree that Astana should be stopped from participaing in this year's TDF. This is not the same Astana team as last year (Vinokourov is no longer riding for them and as a matter of fact, he has quit cycling altogether).
Tom Boonan on the other hand has only been found guilty of taking a recreational drug out of competition and should therefore still have been allowed to participate in this year's TDF.
I will continue to watch the TDF (because it is the most exciting road race in the world) and hope that the mistakes of the past do not come back to blight cycling as in last year's race.