I just do not believe those problems are the source of every issue we face

No one is arguing that. Even the original commenter said:

This is partly the reason

Partly. But they are a reason.

and I don't believe that solving those problems would solve those issues in any impactful way.

There is no single factor which is the cause and can be solved. There are a bunch of partial factors which cause the issue. Fixing any of them would help.