I for one applaud Paul Lister's efforts in stiring up the debate. Whether or not his current plans are practical is another matter. I agree that the area is much too small, but there is plenty of land that will become available once the politcal will is there.
Fear of the carnivores themselves is the least valid of any of the reasons not to re-introduce them. The fear is real enough, but the threat is minimal - you are at much more risk from dogs and cows.
Large Carnivore Initiative for Europe