I didn't say it had more utility. I merely said the having legs has utility regardless of its relation to happiness, as shown by the fact that even people who know that losing their legs will not make them unhappy for long will still put a lot of effort into not losing their legs.

Happiness also has utility, and in your case it clearly has more. All I am saying is that it is not the only thing to have utility, and that if I am feeling altruistic it is other people's utility, rather than their happiness, that I protect.

Besides, happiness is easy to increase directly, recreational drugs spring to mind.