I understand your point, and I also think a bit in this direction. But i think there may be two counterpoints.

First you beeing depressed over the status and worrying at home and online about it, is not really helping your or doing anything against your boss.

Second, as i understand it, the goal is not to get really content, but to get more control over your feelings. It is perfectly fine if zou feel sad or angry over the situation. It shows you what you want or do not want. But this doesn't need to control your life. If you have the possibility you should definitely use your anger to give you energy for the fight for better working conditions. But if you can not, you should your feelings taking complete control over you