Why is anonymity (did I spell that right?) so important? If you're not doing anything illegal or some kind of perv, then why would you care if people can track your purchases?
Taxes.
Paying taxes is immoral.
Taxes (and fiat currency) are used to support war and the murder/imprisonment of innocent civilians.
Using Bitcoin takes away part of that power.
Paying taxes is immoral - yeah - because you've never used roads before, or streetlights, or electricity, or not have to deal with terrorist attacks. What do you think your taxes go to? Taxes support war to protect YOU, and the murder/imprisonment of innocent civilians does happen but is extremely rare and is getting rarer and is much better than the alternative of keeping all criminals on the street. Please use a condom.