Earlier quoted context omitted.
Because private debt is each individual responsibility. Public debt is the money of all tax payers
Exactly. It does not affect me directly. I do not have private debt. The public debt is the fact that someone decided that you will pay for something and get in debt through taxes. Out of control and totally unfair.
When an entire society is built on private debt, it doesn't matter if you don't own debt by yourself, this is a society problem, and thus it becomes your problem.
Also, unless you are super wealthy (and should be taxed more) it's unlikely that you'll stay debt-free for your entire life.