Eh, I am sure you could convince yourself it isn't immoral... everyone in HN seems to think things like google analytics are bad because of the privacy implicat

Eh, I am sure you could convince yourself it isn't immoral... everyone in HN seems to think things like google analytics are bad because of the privacy implications, and doesn't have a problem blocking them (which would also 'mess with a/b tests'). You could just argue that you are hindering their user spying. Not a great argument, but good enough to allow a developer to sleep at night.