Personally, I don't enjoy being on the business end of a firearm - regardless of its action and I'm sure if someone was caught in a killing spree or being shot at in the bush that they wouldn't be thinking "oh phew he's only got a bolt action".
A bolt action in the hands of a motivated individual is equally as deadly.
I'm not sure of the relevance of your last sentence? I've seen plenty of individuals crash and bash their way through emptying a bolt action rifle too?
Given that A category semi automatics have been on the NZ firearm scene for so long, the horse has effectively bolted. There are thousands of unregistered semis out there and introducing legislation to try and regulate them will be nigh impossible to efficiently manage and would, in my opinion, be yet another waste of tax payer's money which could be better used in say... I don't know, catching the real criminals maybe?