"misery is an art form, and the satisfaction people seem to find in it reflects the creative effort required to cultivate it."
"making yourself miserable is a craft all its own, requiring imagination, vision, and ingenuity."
"There’s power in making other people feel guilty."
Sure. But some people feel unhappy all the time. Sometimes for years, sometimes for their entire life. In their case, it is a mental health issue. It's not something they can just shake off when they hear the age-old "you're depressed because you choose to be" argument by a smug author. This approach is outdated and it doesn't work.
Sometimes it is, not always. When I went through long periods of unhappiness it was because of my circumstances and life choices.