You are comparing the demise of an tor drug market to the demise of one of the biggest exchanges with the biggest holdings?
looking at the seized btc stash from DPR I think it is a fair comparison
No it isn't. Not even in that perspective, because the sums that are involved with gox are much bigger.
But the more important aspect is the confidence.
Bitcoin is no longer just play money that is run by drug dealers. Currently it is pushed by legal financing. If some drug market goes bust, then it means nothing in the legal field. Investors with legal interests are even happy to see that bitcoin is distancing itself from drug trade.
But when a big exchange goes bust, that is the intermediate link between BTC and $, then the entire system will be questioned. If gox can get away with "sorry, but the money seems to be gone", then people will question what stops the other exchanges from doing the same. After all, there are no repercussions.
Not to mention that drug dealers/buyers won't be seen talking on TV, how they lost their drug money. But we will see fathers of 3, who will tell their stories, how bitcoin promised them riches, but instead wiped them dry.