You can practice mindfulness and meditate daily and still be depressed about the state of the world you live in. You can recognize negative experiences, embrace them, and still feel empty afterwards. You can see yourself as a bristle on the brushstroke of the universe and still feel insignificant. You can see that life is just a game and not want to play.

In a world with 7 billion people all playing their own game, there's bound to be some people who don't want to play. Calling their game "delusional" is hilarious because reality is an abstraction. Saying you can "control" your thoughts is also ridiculous. You can't control your thoughts, Buddhism, Taoism, etc will tell you that. Your thoughts are you. You can only change how you react to them. No matter how many Alan Watts books people read, acid trips they take, hours they spend meditating, etc some people aren't going to think the game is worth playing. That's okay. No amount of telling them to go to the gym, eat better, and meditate is ever going to change their game.