Apparently many people forget that Bitcoin is only semi-anonymous. Of course, if a normal mortal looks into the blockexplorer, it won't be able to recognize much, but there are already companies that analyze the Bitcoin blockchain and they can already tell quite well how which Bitcoins are used for what. People who want to use Bitcoin for money laundering seem to forget that. Of course there are such cases, but i wouldn't use bitcoin for such things. Sooner or later the goverment will be able to retrace what the Bitcoins were used for.