If after a thorough investigation, Michael Brown is deemed incompetent, fine.....fire him. My issue is with 'piling on', especially before the flood waters have even receded and the facts are not all in. You must be living in a cave to not understand that this President is under unprecedented siege. We are at war, not only against Al Queda, but with the enemies within. Under normal circumstances (no war, etc.), conservatives leveling quick criticism at the administration would be appropriate. At this time, however, it has an undermining effect and is strategically disastrous. It adds fuel to the fire.
No, what would be disastrous would be letting the administration get away with messing up (if in fact it did), just because we're "at war". If the charges are baseless, then no President should have any serious problem showing them to be baseless.
The problem comes not from the criticism (which, face it, is going to happen unless martial law is declared nationwide), but from the administration's inability to handle the criticism.