is there any data showing that Bitstamp and BTC-e are helping investigate the theft of coins from MtGox. They should be in there helping to find accounts associated with the coins. It's in their own interest and the bitcoin community to show that it can self-police and help find thieves.
Where I live, we say "mind your own bussines", I think the best that Bitstamp and BTC-E can do is do their own thing, they already have more on their plate than they can handle without playing internet police.