The saddest was the couple that was killed after they humiliated a neighbor mercilessly, routinely. Cops were ineffectual to his pleas. (Probably not much they could do about taunts and petty infractions other than to tell each side to behave themselves.) One day the neighbor had enough and simply shot and killed them in the street while they videod the whole thing on their own phones. They bled out taking the selfies they were going to post. Then the neighbor took himself out in his own home before the cops could arrive.
I think I remember that one. The last fight/squabble had to do with the two troublemakers, (husband and wife) shoveling snow from their area and deliberately tossing it onto his area. They were destroyed by their own stupidity and need to bully somebody. The poor neighboor had simply had enough and took himself out. One never knows how close another person is to losing all sense of control or logic.
Do you have a link to that story?