The Walking Dead has been around for a while now, which means the many characters on the show have had the opportunity to make some absolutely idiotic decisions over the years. When you think about it, there is no way this group of survivors could actually survive given the choices they have made, but somehow, they continue to get by despite numerous villains, the threat of impending death literally walking up to them and taking a bite, and the worst decisions characters have made since horror fiction rose to prominence.
To be fair, it's easy to sit on the couch and judge the actions of a group of people trying to survive the apocalypse, but many of the decisions the key characters have made on the series don't make a lot of sense. Arguably, some were made in the heat of the moment and were simply bad choices, but others qualify as the biggest bonehead moves in all of television.
That Time Lori Left Carl Behind Without Telling Anyone
Throughout her time on the series, Lori was something of a frustrating character. A lot of fans had a problem with her hooking up with Shane, and while that may have been a crappy decision, it wasn't necessarily a bad one. For all she knew, her husband was dead, and Shane was there for her and Carl. Looking beyond that decision, she didn't make a lot of great ones up until her death. The most idiotic of them had to be the time she left Carl to look for Rick without bothering to tell anyone.
This came when Rick was lost in the city and hadn't come back. Lori was freaking out, which is understandable, but instead of organizing a party to find her husband, she just up and left. She didn't tell anyone, she didn't organize any kind of real effort; all she did was leave, and her kid cried at the prospect of losing both his parents. She ended up crashing her car into a walker and nearly killing herself, but Shane was able to find and rescue her. It was a stupid decision, which didn't result in too much negativity if you exclude the anguish she caused her son.
Sophia Running Away
To be fair, Sophia was just a child when she was separated from the group, but instead of running towards the living, she went off and partied with the dead. Sophia should have known better, but she ran away from the group, and not by a few hundred feet... she fled the area by several miles. After she went missing, the group had to split up to find her, and it fractured the already fragile group.
Eventually, she was found to be one of the walkers stuck in Herschel's barn, which helped close out her story, but also proved the best way to survive was to remain with the group. On the one hand, her decision to run away may have been more related to her age than anything else, but that doesn't make it any less of a terrible decision on her part.
Dwight & Sherry Rebuffing Daryl's Offer To Return To Negan
When Daryl first met Dwight and Sherry, the Saviors remained an unknown entity. What was clear was the fact that these were two desperate people who would do anything to survive. Initially, Daryl was untrusting and antagonistic, but being the good guy he is, he recognized the situation for what it was and offered the protection of Alexandria to the couple.
Instead of taking him up on the offer, they opted to rejoin the Saviors and return with them to the Sanctuary. This was one of the worst decisions anyone could have possibly made on the show. Dwight gets half his face burned off for his troubles while Sherry returns to a life of abuse at the hands of Negan. She ended up taking the top spot as Negan's favorite wife while Dwight moved up in the ranks as well, but they would have fared far better had they taken Daryl up on his offer.
Negan Incinerating His Only Physician
In a world overrun by the dead, it's important to keep your resources close at hand. That includes everything from a bottle of pills to a can of food, but it also means the people with the knowledge and skills needed to keep folks alive. An engineer is good at building bridges and maintaining buildings, but a doctor is vital for the survival of everyone. They are rare in the world of TWD, which is why it makes absolutely no sense that Negan would kill the only one he had.
Upon learning that Sherry was dead and had plotted with the good doctor behind his back, Negan institutes his own form of justice. Granted, it was all a ruse pulled off by Dwight, but that hardly mattered to Negan, who wouldn't even let the doc defend himself. He threatened to burn the doctor's face with an iron but instead picked the man up and threw him face-first into an incinerator. Doctors are hardly expendable, but Negan didn't even think about that when he made this stupid decision.