He was a independent reviewer of legislation in the House of Lords, where he sat as a Lib Dem Lord. In other words, he looked at terrorism from the legal end.
He's offering a political opinion, rather than an operational one. I'll more go with the verdict of the people at the sharp end.
Meanwhile, a former SIO for the Met ('believe me, he's no lefty' - Own Jones), someone who had to deal with crime in all forms on a daily basis, fundamentally disagrees.
Of course we've never had 'bobbies on every street corner', and it's missing the point.
It's about the whole concept of effective community policing. Of being the first in the line of ensuring the state is there to protect you as best as possible. Of the community having someone to turn to in...