It makes sense when looking at it from the other side...
... I mean such "Anti-Terror" laws are great for eliminating public outcry about other topics. The public in the UK probably should be on the street demanding better social systems and similar things. With those laws you can simply lock away people you don't like.
This has been done in Germany already at the Anti-G20 protests in Hamburg. Just claim that protesters were violent, surround them so they cannot flee, then arrest them.
Biting the hand that feeds IT
