S: well shit didnt know you guys would get all blah blah dont be a layman moralist loser and shit. so ill just examine the argument.
"I think we should maximise happiness"
Because
"happiness is something that everyone wants"
And
"I wonna give people what they want"

Well since I'm an egoist, or what ever you want to call it, and think that we can only ever do, or want to do, what gives us pleasure (in a broad sense) I can't really criticise you for wanting to maximise happiness because you want to maximise happiness. That's all it seems to be though and I don't see J's appeal to reason anywhere. it seems to boil down to "Making others happy makes me happy." yah? nah?... wha?
Also it seems that if your holding a doctrine such as "I want to make others happy" because you want to, it seems unnecessary; you could just skip a step, get rid of the doctrine and do what you want regardless of others happiness by the same logic.