Folks aren't even able to get out of debt. Considering debt generally has a higher interest rate than savings, folks are even held back from saving. OP even mentioned that straight out. If you're a disaster away from destitution, you aren't investing money. Money years from now isn't worth more than money today when your bills are due today.
Totally, debt stifles saving. All rich people are alike; each poor person is poor in their own way, or something.