They always want more
Politicians by profession always want power, so they think the solution to every problem is giving them more power.
FUD, give us power, Fear#2, give us more power, Fear#4863856 etc..
The irony is the more they want the power to spy, the more they encourage more & better encryption and not everyone will play by their laws, like other countries and criminals (who will buy encryption tools and services from hackers). So while they won't stop criminals, they will get increasingly more intrusive and powerful spying on the general population.
But then Politicians want more power over (the majority of) people. That is where their power really comes from, so they want more power, and so it continues to get ever worse.