Look, try to hire emotionally intelligent people. Be honest to them about what they're getting into when they get hired (ways in which the company operates, the technology stack the company is required to support, etc.). Finally, be open to suggestion when you can be accommodating to better ways of doing things that are mutually beneficial. If you're still having problems, you might need to acknowledge that you made a bad hire and act accordingly (toxic people make your emotionally intelligent employees unhappy in ways that you are responsible for).

Obviously optimizing for "happiness" in some sort of naive, single-minded sort of way is not the way to go about things. If you have the type of employees that you have to infantilize and throw dumb perks, entitlements, and power to in order to make them happy, you need to reconsider a few things. But on the flip side, if the only inputs to your model of employee wellbeing are "bad news" and "ignorance/delusion", you're probably running an abusive workplace.

This kind of stuff shouldn't be rocket science.