But see then you're just skipping the philosophy part to prove your point. Why must we all agree that happiness is better than misery? Why must we all agree that morality is based solely on what makes one happy? Even if we assume what you want us to assume, what do we do if the happiness of two different people are at conflict with each other?
These are all questions that only philosophy can answer. There is no scientific way of objectively answering those questions.
While forms of happiness and misery can and do indeed differ...
If we can't even agree on something as basic as - happiness is better, misery is worse, lets have more better and less worse...
Then we are totally and irredeemably fucked.
I mean... are you seriously trying to romanticize the notion of misery? Rape, murder, enslavement among other things?
It seems so fundamentally obvious that any 'philosophy' that purports to discuss the merits of suffering for its own sake (i.e. there's not some great pay off for your self flagellation, or there's no merit to your asceticism) should be dismissed out of hand.
If we can at least agree on the notion that we want more better and less bad... more happiness less suffering - whatever form that they may take...
Then we can start to use our understanding of the world, our human natures and mix it with logic and evidence to start devising effective solutions towards increasing the degree of human happiness and reduce the degree of human suffering in the world.