Why do people purchase hybrid cars?

Why do people purchase hybrid cars?
People purchase hybrid cars for some combination of 3 reasons:
1) They are more fuel efficient and thus buyers spend less for gasoline (petrol)
2) Because they are more fuel efficient, they release less pollution
3) They happen to like the particular model of car and it happens to be a hybrid.

Personally I purchased my hybrid because it was fuel efficient and we put something like 30,000 miles (48,000 kilometers) a year on it, so the price of fuel is a major consideration.