No-one argues against more security, if for no other reason than the 'feel-safe' factor, but even an entire army could not have stopped the Moscow attacks, or those on the London Underground in 2005. Just a few well-placed suicide bombers in a public arena (a Rugby World Cup event for example) and a city grinds to a halt for days.
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There's a naivety that claims attacks like this won’t happen in NZ: it’s harder to blend into the crowd here than in Europe or the Middle East...we’re geographically isolated from trouble...we don’t have "people like that". But conventional wisdom also said women would not become suicide bombers... well, that's just gone out the window! And let's not forget the Maori activists' "terror training camp" incident of 2007. So it would be foolish to think that suicide bombers would never attack in NZ.
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