I understand the point you make but I would counter that being happy doesn’t mean you aren’t aware of the world and injustice around you. It doesn’t mean that you condone it, think it’s good, etc. It does mean you probably avoid self-destructive behaviors like excess drug use, poor sleep, etc.

Many happy people are also agitators for change.

Not to say that happiness is a choice, but you can certainly make choices which make you sick with anxiety. It’s a disordered behavior to purposefully reinforce your sadness and anxiety about the world for no useful reason.

For instance, many people feel compelled to expose themselves to the horror of certain ongoing events constantly, via video. There are whole subreddits dedicated to it, on every side of most conflicts. At the end of the day, that is neither healthy nor productive, solely self-traumatizing. One reason this is a pernicious behavior is because it feels like there is righteousness in being a witness, but in reality it’s no different than self-harm.