Blaming others for your unhappiness is a habit that’s hard to give up because it triggers some happy chemicals. You feel important when you battle perceived injustice (serotonin), and you bond with others who feel similarly deprived (oxytocin). You get excited when you seek and find evidence that you have been denied your fair share of happiness (dopamine). You may even trigger endorphins by welcoming physical pain into your life as evidence of your deprivation. You keep building a circuit for seeking happiness by feeling wronged.