The emails would not be stored on her computer!!! They would be stored on the mail server which is backed up and archived, the fact her computer crashed is irrelevant!
But let's just play along and say they were, the IRS was not following federal law and all of those email are lost for good. That alone proves incompetence, irresponsibility and contempt for the law which SHOULD trigger a deep anal probing investigation. Just imagine if you used the same "computer crashed" excuse as a defense in an audit? How much understanding do you think you would get?
Ok, yes, they have a problem in not complying with reasonable practices on saving emails. That's not criminal. Don't go overboard.
What you and the others want to do here is, despite all of the evidence to the contrary, use their incompetence in not keeping emails as a justification to conclude its purposeful. That is not warranted here, at least not yet, and your insistence that its just obviously the case that its purposeful undermines your credibility and supports the opposition's charge that the claims are based in pure partisanship.
If it were me leading one of these committees, I'd issue something like the following statement:
"We have learned that the IRS cannot produce emails for Ms. Lerner for approximately two years. That is unacceptable. It is standard practice to save emails to a server, or through the email system itself.
This thwarts our ability to fully investigate the situation. We therefore intend to subpoena the information technology personnel who worked on this particular issue, the appropriate personnel at the agency generally responsible for maintaining all emails, and the director of the agency.
At a minimum, the failure to preserve emails is a serious breach of accepted minimum practices for all federal agencies and we will get to the bottom of it."
Then, you have appropriately said your outrage and you have hinted that you want to find out if its real and are going to talk to a lot of people to find out whether it was an excuse. That way, if the evidence falls flat you can still say they are in the wrong, because they are. And if the evidence is that its gaming the system, then you open the door to getting into that.
What you have not done is make the huge leap from negligence to nefarious. And it is that constant leap that the GOP makes, particularly these committee chairmen, to get on Fox News, that is so unwarranted and, frankly, distasteful.
A little reasoned restraint here would lend that committee process and effort a little credibility, which is so sorely lacking right now.