Do you really believe these govt thugs are going to leave the truly innocent parties (such as myself) alone once they have their data? I don't.
Who knows? They don't understand what they're dealing with (bitcoin), and may well make up whatever bullshit charge(s) they feel like, and there will be little I can do about it.
Would you feel comfortable handing your data over in this situation? I don't.
Bicoin is not that difficult to understand but I can understand your fears about the irrationality of some policy enforcers. I personally dont have these fears and will give my id if necessary. if they did lean on nefario and they have access to the db and to the server logs they wont have much problem tracking me through my mail account.
Any way as far as we know this is scenarios are not happening. people are just imagining and exagerating stuff and none of the people who really know what is happening are willing to tell it straight.
From what I understood any AML regulations information and data taken will only be provided to the government/police if he is required to do so. Implying the authority's are not necessarily asking for such information at this point or at least not for everyone.