system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] If Voldemort made speaking his name a taboo so that Death Eaters could easily trace the speaker, why didn't he make the phrase "He-who-must-not-be-named" a taboo as well? Wasn't there like a 90% chance if someone said that phrase they were probably referencing Voldemort?
gpt
Because if someone says He-who-must-not-be-named, it means they're afraid of him, and no threat to him. References to him ARE going to come up, since the ministry has blatantly begun acting on his agenda. But if someone is saying He-who-must-not-be-named, they're going to be saying it in whispers to dismiss the notion, and if someone bursts into their house a minute later, you've confirmed what they just dismissed.

He couldn't just kill every single wizard who wasn't a Death Eater, so he needs to instill fear to make the population compliant. And nothing shows fear more than being too scared to say Voldemort.