There's a special place in my heart for children's television. I grew up on Captain Kangaroo and raised a passel of young ones on Sesame Street, and I will defend to my dying day the idea that entertaining a two-year-old is one of the honest trades in show business. So it genuinely pained me to read MSN's piece on what happened to Ms. Rachel, because what happened to her is what happens to everything the internet gets its hands on. First it loves you, then it conscripts you.

If you've got a toddler in the house, or a grandchild, you know her. Ms. Rachel, bow in her hair and the patience of a saint, built an enormous following doing songs for the little ones. Her stuff was good. I mean that as a professional compliment. She talked to children like they were people instead of marketing demographics, which is more than most of Hollywood manages with a hundred-million-dollar budget. Parents adored her precisely because she wasn't trying to be anything other than helpful.

Then she discovered geopolitics, and a children's entertainer discovering geopolitics is a bit like a golden retriever discovering a lawnmower. Nothing good comes of it and everybody ends up shaken. During the Gaza war she started posting activist content to her enormous platform, and according to the reporting, her rhetoric drifted far enough that critics now accuse her of functioning as a mouthpiece for Hamas. I'll let the lawyers and the fact-checkers sort out the precise wording. What I can tell you as a critic is that the pivot was a catastrophe on every axis that matters to her actual audience.

There's one part I keep coming back to. Her viewers are, on average, about three years old. They cannot spell ceasefire, let alone parse one. So who were those posts for? Not the toddlers. They were for the approval of other adults, the ones in the industry and online who grade your soul and hand out gold stars for correct opinions. She had the most trusting audience in all of entertainment, and she used the channel built on that trust to perform for the least trusting audience in all of entertainment. That's the oldest deal with the devil in show business, and everybody who takes it is surprised by the price.

The price, in her case, is that she's now a polarizing figure, which is a remarkable thing to become when your core demographic can't yet tie its own shoes. Once a children's performer turns into a culture-war lightning rod, the parents flinch, and the three-year-olds aren't the ones holding the remote. Fred Rogers understood this better than anybody who ever worked in the field. Decades in front of children and the man never once used his desk as a lectern for anything except making a point about kindness. He knew the job was bigger than his opinions. That kind of discipline has apparently gone out of fashion.

Miss Frances on Ding Dong School, Bob Keeshan, Rogers, even the Sesame Workshop people at their most ambitious, they all shared one conviction: the child comes first, full stop. The moment you decide the child's screen time is really about your conscience, you've stopped doing children's television and started doing propaganda with finger puppets. Parents can smell the difference from the kitchen.

I don't wish ruin on the woman. I wish she'd remembered what she was for. But the story is worth telling because it's the same story I've been writing about Hollywood for years, just wearing smaller shoes. The audience shows up for one thing, the people behind the camera decide the audience really needs another thing, and then everybody acts stunned when the audience walks. It happened to the blockbuster, it happened to the streaming series, and now it's happened to the lady who sang about wheels on the bus.

The lesson never changes, so I'll say it one more time for the cheap seats: entertain the people who showed up, and save the sermon for your own time. Mr. Rogers built a legacy on that. The industry built a graveyard ignoring it.