If anyone wants an honest answer to that question it is fairly simple. Polling has suggested - very consistently and over a long period of time - that a majority of the British public (though often a fairly slim majority) tend to support authoritarian interventions by our governments in the name of protecting the public. Most of the time our governments and government agencies do appear to use such powers responsibly and so they tend to maintain that public trust. There has always been a significant minority who were more cautious on civil liberties grounds and there has always been an issue that the supportive majority aren't always very well informed about what could happen if the laws were applied more strongly in practice.

As a personal observation - I think this might start to change over the next few years and the current positions of MPs and government might start to look very out of touch. We are seeing the fall of our long-standing "big" political parties and the rise of a very right wing populist party that is increasingly looking like it might actually win significant power at the next general election. I think awareness of the potential for abuse by the next people to run the government and agencies is growing among the general public. Whether it grows enough to stop some of these policies from becoming law in the near future is a different question of course.