Why would we think he would say anything else? That's his job, and presumably he's surrounded by plots and threats that he needs to counter every day, so his perspective is going to be a little biased.
The important thing is that whenever a policeman or agent says something like this, we respond by thinking "well obviously he would say that" and take a view on whether that is proportionate based on the wider civil liberties consequences. The fault is not that they would want that, everyone always wants more power to do their job more effectively, is that we have weak politicians that grant it too easily.