There are a number of flaws in your argument. The first is that we can do two things at once. Using privacy-protecting technologies is not mutually exclusive with promoting privacy-protecting legislation. We can, and should, do both.
But the more significant point is that using this stuff, as an individual, isn't really going to cut it without more, but who says that's the idea? We need to be creating things like this. What we have here is a list of open source projects you should all be contributing to and promoting to anyone you have influence over, and a list whose holes and shortcomings provide opportunities for creating new things.
I mean what good is Diaspora if everyone you know is still on Facebook anyway? But if you create an account and use it regularly, and convince as many people as you can to do likewise, that's how change ultimately happens.
And what you can do is: Read Facebook, write Diaspora. Don't shut off your Facebook account if all your friends still use it. Not enough people are sufficiently purist for that to scale. Just stop posting anything to Facebook that doesn't consist of "I just posted something you might be interested in to Diaspora" and then let all your friends wonder what they could be missing.