If there isn't more of this going on behind the scenes already, then I think there should be. How naive would we be to think there are not spies among us all the time. Every major corporation should have paid informants in competition companies. The police should have contacts in every grass roots and international organisation - Greenpeace, Amnesty, PETA et al - that has ever raised its head above the surface.
I think the worst part of this debacle is that they guy got caught. He should have been more careful, and I think our tax dollars should be spent on clever people, not idiots.
And of course, the one who sprung this on us is not beyond reproach. Her timing does seem a little contrived.
Information is power, and I have no problem with the police spending resources keeping tabs on these activist groups, and who's sleeping with who in the organisation. They need to be fully aware of the strengths and weaknesses of the group.