Better to have it and not need it, than need it and not have it.
A bit like the pick axe handle under my bed, the axe down the side of my settee and the machete above the front door. I've never had to use them, but I sleep better knowing it's there, safe in the knowledge that if some scummy chav breaks into my house, they're getting fucked up, not me. I say, more jet fighters, nuclear subs and artillery. Keeps the chancers away.