monitoring
but of course I don't object to monitoring by the government ... [to stop 'terrists' etc.]."
Nothing wrong with monitoring for that kind of purpose, the issue is that it will be abused. Almost guaranteed. That's what happens with governments and interceptions around the world.
And what worries me further, is requirements creep, the database is going to prove useful to a lot of government agencies when that data is combined with data from other databases. The government will claim this will never happen, but you know full well it will. And some b**stard official will allow the operators of the database to sell some elements of the data to any tom dick or harry that wants it, just in the same way the DVLA does now, to make a fast buck.
The data will be moved around from place to place and some tosser will lose a DVD or magnetic tape of.
The operations staff will end up being bribed into doing searches of any future would be politician/senior party official, the dirt being digged up and leaked to the press to destroy their career.