I as much as anyone else am not for wasted time and money on political games, but just like what brought scooter libby down and even nixon, it was not the crime (or in this case, act, since the original act was likely not a crime), but the cover up.
if these people were fired for purely political reasons, then why didnt bush just say so? All this shit we hear about "pleasure of the president" hasnt' come from the AG, its come from right wing talking heads. In the end, its is arguable whether even firing for a bad reason is allowed or not, but we weren't allowed to know at all because this president wouldnt admit it.
and some people were were guilty of minor crimes ended up going to jail for purely political reasons.
Likely (99% sure) Mukasey brought these charges because he found evidence of obstruction (destruction of records, intentional mistatments, unaccounted for records, etc). These are things that are black/white issues. If you destroyed records or retroactively changed a performance review/justification, thats a crime, even if it isn't covering up anything.
And thats why this is going on.
Beyond that, even Mukasey (sp?) has to see that the AG office has become an absolute joke. This is an office that, until bush came to power, was completely apolitical, seen as above the fray, and completley trustworthy. If the feds came after you, you did something very wrong. Under bush, they came after you if you voted against the war. its scary and embarrassing stuff going down