Well, Ted Kaczynski is certainly someone we should emulate right? Go live in a cabin in the woods, and send bombs in the mail to people, sounds like the epitome of great mental health.
Someone might have a good analysis of the problem but being incapable of coming up with an appropriate solution to it. These are definitely two different skillsets.
Imo a lot of what Kaczynski says is actually very well thought out and there are multiple other philosophers and thinkers that have come to similar conclusions or have pointed similar problems with society.
If you had read that statement without reading who it was that said it, what would you have thought about it?
Fair. If I'd read that without the ascription, I would've considered it to be an overly simplistic view of things, that was probably influenced by Bill Hicks' comedy/social commentary [0].
Reducing the multiple potential causes of depression to "society is bad" does a dramatic disservice to people who suffer it.