Can you explain why modernism is an "obvious disaster"?

The "machine for living" philosophy is intended to be ergonomic, but is extremely rigid and therefore as soon as there are unanticipated needs it ends up anti-ergonomic.

There is also a great tendency for modern architecture to be selected purely based on looks, which produces all kinds of strange anti-egonomic disasters. Libraries that echo. Office blocks that focus the sun onto random burning spots on the street.

Then there's the effect of anti-ornamentation on the human psyche. I seem to remember that one of the modernist car parks in Britain was demolished partly because too many people were committing suicide from it.