“I think the idea of anyone ever using a nuclear weapon anywhere in the world is utterly appalling and terrible. It would result in the destruction of lives and community and environment of millions of people. I would be actively engaged to ensure that danger didn’t come about.”
Frankly, this is the sane viewpoint to have on nuclear weapons. The idea of actually firing one against a civilian target is certainly horrifying, and it isn't something we should be flippant about.
For a peacetime government, I think simply owning nukes is a sufficient threat. If you're a potential enemy of the UK, would you assume that just because Jeremy Corbyn is PM our nuclear deterrent is irrelevant? Or would you still consider our nuclear weapons an active threat, given the possibility for Mr Corbyn to change his mind, be overruled, or replaced? If you were wrong, if the UK turned out to be willing to retaliate, the cost would be dire.
I really don't think anyone should be keen on the idea of mass killing. It's a tad sociopathic. And I don't consider that the deterrent is any more effective just because we have a PM who seems eager to pull the trigger.