The only way I could agree with you would be when speaking about a reasonably intelligent, healthy individual not living where health is a bankruptcy lottery. As it stands now - and I apologise if I completely misunderstood a poorly written comment meant well - your comment sounds like coming from a Martin Shkreli-like sociopath.
"To welch on one's debt"[0], if I have to believe the Merriam-Webster diary, means to avoid payment, and has gained an offensive connotation. You might want to be more careful about your use of language describing such a sensitive subject as debt.
Defaulting on one's debt is not necessarily due to irresponsibility. People sometimes have really bad luck for example. Or they're just plain stupid, with insufficient regulation in place to protect them from their own limited intelligence.
One might also want to look at the context of borrowing, from a human perspective. I'll give just one example.
The lender side of the equation. There's plenty of irresponsible lenders, often with far too little regulation. My native Belgium has some interesting lending regulations:
* All loans taken by individuals are gathered in a database run by the national bank.
* Lenders are legally obliged to check the lending database before offering a loan, in order to assess the risk. If they don't, or if they recklessly extend a loan, the borrower can legally walk away from it.
* Lenders are required to obey strict APR limits [1], or they risk the borrower legally walking away with the principal, and without interest payments.
[0] https://www.merriam-webster.com/dictionary/welch
[1] https://economie.fgov.be/nl/themas/financiele-diensten/consu...