THEY HAD TO GO, LITERALLY!
ALL THE UCHIHA ARE GENETICALLY DISPOISTIONED TOWARD SCHIZOPHRENIA AND VIOLENCE. THEY ALL HAD TO DIE FOR THE GOOD OF THE EARTH BECAUSE THEY'RE SPIRITUAL REINCARNATIONS OF THE MOON GODDESS' ASSMAD SON WHO GOT KEKED OUT OF DIVINITY BY HIS BETA BROTHER!