What makes them 'anti-police' (apparently) is that they challenge the misuse of those powers, sometimes emotionally, sometimes robustly, often persistently because they see that things haven't changed or they're not changing quickly enough. They're not waiting 30 years, they're raising it now, because it is happening now. If that's what makes someone anti-police then I, like 'them', am guilty as charged.
There has been a lot of progress recently within the EU on measures that facilitate prosecution in judicial and police matters, such as the European Arrest Warrant. The EU felt it was time to take action to balance the newly afforded rights given to investigating and prosecuting criminals such as the new arrest warrant, with the protection of procedural rights of individual EU citizens..