Do you understand how much you are talking only out of your experience? You aren't even considering that people will react differently to seeing that stuff, or that people might not find cynicism in the human nature (or realism as you frame it) valuable, and would much rather want to see the beauty, as naive as that may be.

It might not be harmful on an objectively quantifiable measure, but it will have an effect on people and what that effect is depends on the person.