You probably don't know very many poor people then, because poverty, food insecurity, physical insecurity, homelessness, job loss are all very common depression triggers. It's just that these cases don't make the front page of newspapers at the same rate as celebrities committing suicide.
> no mental bandwidth for things like spiritual constipation
That's a feature, not a bug. Fighting for life has more meaning and purpose that yearning for death. We're designed for it. It has only recently become atypical.