Why? Well apparently he went to the Farnborough Air Show which they say is actually an arms fair, and this makes him a hypocrite on the subject of knife crime. Tell me, truthfully, and honestly, has anyone that wasn't a complete moron of the highest order ever considered a fun day out for kids and adults alike with candy floss, fairground rides and lots of cool aircraft showing off ever considered it an arms fair?
Of course, some of those 'sophisticated' types that do would probably consider this response a rabid reactionary Daily Mail one. Personally I prefer to say that it's a 'not living in cloud cuckoo land' response. Planes are cool and enjoying watching a Typhoon do crazy acrobatics does not make one complicit in the bombs they might drop expect in the dodgy world of idiot fallacious reasoning that so often goes hand in hand with single issue campaigns.