Lord McDonald is a former director of public prosecutions.
He established the Counter Terrorism Division, the Organised Crime Division, the Special Crime Division and the Fraud Prosecution Service.
and has reviewed our counter terrorist powers
So he ought to know what he's talking about.
He says Britain over reacted in resopnse to 9/11 and 7/7 and some legislation went too far
http://www.bbc.co.uk/news/uk-12283114
Of course the knock kneed brigade will always call for more and more draconian powers as their fears dictate and they don't see any 'cost' to them and governments can find it hard to resist them.
The cost of course is that we all end up as a restrictive frighted society cowering behind the sofa against a threat that over exagerated.
Hint - this is where you come in and say "you wouldn't say that if your child had been killed in 7/7" - and sit back thinking how clever you are.
Risks have to be taken in perspective - not from the viewpoint of a few people who've been on the recieving end of an incident like this
52 people died in 7/7 More than that die in a week in road accidents