I don't know how many of you have read "10% Happier", but it was a bit ahead of the curve with the current mindfulness / stoic fad that's been floating around the Internet.
Toward the end of the book, Harris talks about how being zen is great, but also not terribly effective in the modern world, specifically in the modern workplace. So it's ok to be chill about some things, but there are other things you absolutely can and should get mad about. Otherwise, you're not living your life, you're just being a zombie.