This Trident thing...

Please explain to me just who we're going to nuke?

For extra credit, compare to insurance against badger attack: £1000 premium, and we promise to gas the one wot bit you.  Explain how Trident offers a substantially more well-priced policy against a more credible threat.

Please explain to me just why this is anything more than reluctance to leave the Big Swinging Dicks Club?