As a big fan of cryto currency i agree with Bill.
It is still in its infancy and the lack of accountability (not traceability) is a factor of it's source as non government. In time it will be regulated.
We only have faces on our coins due to the same problem of regulation of currency a couple of thousand years ago.
Yes it has been spent on bad things, but not sure how that is relevant to a currency, it's not the currency's fault*
*Well except for the new altcoin coming from a Leeds hash dealer, called Tick