Regret and guilt

Things could have gone otherwise... and this guy, former camp counselor, beloved by children and trusted by his employers, could have left the Dakota Building, that 8th of December, with the gun still in his pocket, and then thrown it in the Hudson bay. But he didn't, and so he managed to become one of the most hated men in the last thirty years.
Life is made of choices, and sometimes, even when everything tells us to change our mind, we pick the worst one.