Well for one, BitCoin isn't all that anonymous. If you really try you can maintain anonymity but you can do that with regular money if you really try too.
I'm not entirely sure what civil liberties are being infringed because my financial transactions are being monitored. If a camera watches you buy your lingerie, you just lost your IRL cash anonymity too.
And again, despite all this talk about civil liberties and people needing to be anonymous, virtually no legitimate businesses have considered that a big enough deal to adopt BitCoin. You could probably argue that, considering this anonymous money has pretty much no legitimate uses at the moment (Unless you consider speculating legitimate) and has become basically the official currency of the deep web black market, and is used for buying things like CP, weapons, and fucking people, that maybe anonymous money is more trouble than it's worth.
If a camera watches you buy lingerie it's because someone was looking for you there at that time. On the other hand, a credit card transaction can be traced back to that shop months later without the person knowing you went there in the first place.
The civil liberties this relate to are privacy and anonymity. Yes, these are an official civil liberty.
Civil LibertiesPrivacyFinancial privacy is part of this. Previously we had a choice of paying with a non-traceable cash currency or using a traceable financial institution's money transfer system. Prior to the widespread use of EFTPOS there were cheques and manual credit card transactions to accomplish this.
Your financial history can be used to cause discrimination, personal embarrassment, or damage to your professional reputation. Where and how you spend money reveals your preferences, places you have visited, your contacts, products (such as medications) you use, your activities and habits etc. If you wanted any of this information concealed, you could pay with cash and avoid ever leaving a permanent record with your name attached to it. Currently no such system exists online.
Bitcoin uses wallets that show a record of purchases attached to that wallet, but
the wallet doesn't need to be linked to the person using it. This is where the system offers more anonymity than other products like Visa gift cards, which all must be registered with a person' identity in order to be used.
Though the next question should be asked, if there no correlation between anonymity, and black market activity, then why on the onion network, it seems to be especially easy to find black market goods and services, with most of those sites accepting bitcoins.
The same exists for cash. How many drug deals do you think are paid for with a credit card? Does this mean that cash is evil? Or since most child pornography is distributed online does this mean the internet is only used for evil purposes? Only the application it's used for makes the transaction illegal, not the medium used to accomplish it.