"There are, at least, three possibilities:
1. It shows that there's something fishy about happiness research.
2. It shows that utilitarianism is wrong.
Causing someone's unemployment is qualitatively different from causing someone's death - especially if you intend one but not the other - and you just cannot compare them on the same scale.
3. It shows that unemployment is indeed a social evil of huge magnitude, a fact which we don't realise because the jobless are socially and politically marginalized.
Personally, I'm not sure how to respond."