Well, it's still a better car in most ways. People don't only buy the cheapest car.
Is your car already air conditioned when you get into it? The Leaf lets you set that. You're literally more comfortable in a Leaf than you would be in most cars. And the difference in running costs is not extreme. And yes, the equation in the UK is different, gas is more expensive, and there's more charging stations. But America will catch up, and the Leaf/electric cars are getting ever cheaper.
But no single car is right for everyone; but I do find the extremely common hatred amusing.