I agree but there are different ways of going about it. In the particular case I know of, a police officer infiltrated all left leaning student organisations in order to get access to the more radical ones. By infiltrated I mean that he went to their meetings, was invited to parties and reported all their personal information. In any case, I just wanted to defuse the argument that the government is probably not that interested in your data. Its far easier to turn devices such as this against you, I mentioned the case where they recorded the phone numbers of every mobile device at a largely peaceful demonstration. Since there is no reason to ever delete this data, you not only have to trust that the current government is benevolent and reasonable, but also that this form of government is stable, does not crumble and you don't end up on a kill list 20 years later. This might not be an issue in the West, but there are countless cases around the world, where based on much less information political activists / dissidents were murdered.
That's a perfectly sensible thing to do. I would do the same thing. Any enlightened person would do it.