This has nothing to do with teeth.
The man did a Bad Thing, and hundreds of people got to help punish him from the comfort of their homes and then move on to the next thing the internet dropped in front of them. The guy who shot Cecil the Lion was a dick, but it's kind of horrifying that the people who unraveled his life did it in between posting snarky YouTube comments and sending Snapchats of their genitals. We've turned the complex psychological process of wreaking vengeance into just another one of the dozens of social media "highs" we get throughout the day.
Back in 2004, when attacks by huge groups of anonymous internet people were still a fairly new thing, some talented 4channers programmed the Low Orbit Ion Cannon. It's a piece of software that makes it easy for anyone to devote a portion of their computer's processing power to carrying out DDOS attacks on a single target. The name is a reference to one of the superweapons from the Command & Conquer games, a giant space laser that fucks up its target and everything nearby.
We're not supposed to wield this kind of power in real life.
The name was a tongue-and-cheek sorta thing and not very accurate since 4chan's Ion Cannon was used in very pointed attacks at single websites/organizations, like the Church of Scientology. But modern internet justice works exactly like an Ion Cannon, blasting its target and anyone nearby.
Innocent People Always Get Hurt (And Most Of Them Are Women)
Back before the media storm kicked up around Stanford rapist Brock Turner, when his trial was just getting started, his childhood friend Leslie Rasmussen wrote a letter defending his character. She wrote that the rape her friend committed was really just a "huge misunderstanding." It was a dumb letter, but every 20-year-old in the history of social media has written something dumb, somewhere. Most of us don't pay with our careers.
Leslie's the drummer of a band, Good English, and the backlash against her has essentially cratered the band's future. Note that neither of Leslie's bandmates even did anything wrong. Brock's father actually wrote a vastly more offensive letter defending his son, but he's a well-established government contractor. There's just not much internet backlash can do to him: Leslie and her band were way more vulnerable.