I do see your point. It's just that when someone says "I want to be left alone" a hundred times, I start to think they want to be left alone. "Leave me alone"

I do see your point. It's just that when someone says "I want to be left alone" a hundred times, I start to think they want to be left alone. "Leave me alone" is different from "I want to be left alone." The second implies you want to be left alone by everyone.