What you just said has a Glass half full/Glass half empty perspective.
The positive perspective alternative will always achieve a better result for everyone if it is what’s desired.
Since what is desired is varied then increasing happiness for one will sometimes decrease happiness for another.
That said happiness shouldn't be the highest standard anyway.
Fair enough although there is usually a means to create happiness for all. As with the room too cold/too hot situation. Cold gets warmer clothes/hot get cooler clothing. Everyone happy
Glass half empty perspective 😉 It is just as easy to assume that the cold will be grateful for the warmer clothes/heat and the hot will be grateful for the cooler clothing/AC