Sympathetic characters are a story's most valuable currency. Authors can kill them off to get a strong emotional reaction. However, the strong emotional reaction is less valuable than just keeping the character alive unless that emotional reaction is used to to aid another significant story goal.
Amateur authors will often see others carefully spending their currency and cry that it's predictable and boring, then kill off characters wildly to stand out. At first, they might be successful in standing out. Then they find themselves in a hole because readers don't have those sympathetic characters as purchase points to make them give a fuck about the events that are happening, and they're also wary of getting attached to new characters, and the response they get for a character death has gone down from overuse. Then the amateur author realizes that they've fucked up and the story goes to shit as they flail wildly to find some way to continue to generate interest, and maybe it works for shit-eating retards but people with taste or those who have been through a similar shitshow leave.