The mental health expenditure one isn't that clear cut. Like e.g. reported rapes rising, you have to seperate out whether it was always happening (possibly much worse) and people just ignored the problem.

This may be depressing to you, but there will never be a point in time where there are no problems to be solved. You better enjoy the small wins when you can.

For global warming, the correct analogy is probably sacrificing tomorrow's resources in order to make today's quality of life worse, which is doubly dumb. Many of the scare stories of "solar PV can't support a modern civilization" are just lies put about by the people who can benefit themselves (not society as a whole) in the short term.