There's little point having a punishment for an event that is pretty unlikely to be repeated is there ?
As being involved in a crash is a rare enough incident such that fining someone for delaying others while collecting your bags isn't in a practical sense, likely to amend their behaviour of a future event as the chances of them being involved twice is vanishingly rare.
I understand people don't want others to stop to collect bags, but as others have said, its human nature and fining them after the event is pretty pointless.
Best simply stop them from flying again if anything, but a monetary charge is never going to work from a practical sense.