Mission creep means “the expansion of a project or mission beyond its original goals.” source It is a way to describe when something created for a good purpose somehow changes bit by bit into something it was not originally intended to be and not necessarily ‘good’.
An example is the law governing what can be done with CCTV cameras. The Regulation of Investigatory Powers Act [more info] allows certain public officials to use surveillance technology such as CCTV to watch the public. It was intended to prevent serious crime and terrorism. However, in 2009, a survey of local councils "uncovered the widespread use of covert surveillance to combat littering, fly-tipping and dog-fouling… …It is the use of anti-terror laws to combat this sort of 'environmental crime' that has infuriated the law's critics.” Find out more
In other words, a law intended to allow a small amount of public surveillance under strictly limited circumstances was ‘stretched’ by public officials to become something much more invasive than intended.
Should we presume that those who control surveillance tools are always ‘good’, ‘just’ and ‘fair’? Or should we worry that ‘power corrupts’ and have strict legal limits to protect our privacy?
Imagine you lived in a country that didn’t have a good record for fairness and human rights. Would you still hold the same views?
If in the future, an extreme political group won the general election and formed a Government in the UK, would you still want the cameras?