"I also mostly pay cash for stuff, and the only credit card debt I have is 0% cards."
And...
"In rare occasions I may incur small debt if someone is offering 0% credit (like my cell phone on my current plan), but I can't see that contributing to anything. Thoughts on any of this?"
Not regarding the National Debt, but on personal credit.
Several years ago I bought a truck. The dealer of course wanted me to finance with one of the banks they do business with.
I told them I would be paying cash or possibly use my Credit Union which always has the lowest rates around for mortgages and other loans. So, just to see what kind of interest a vehicle loan would be, I gave the dealer's business manager my info. He came back shaking his head and told me he had never seen anyone with a credit rating as high as mine- which meant I could get the best rate their best bank could offer.
That best rate was higher than my CU, which didn't surprise me. I told him I would just pay cash- which I did.
A couple of weeks later I get a letter from the lender saying they denied my loan. WTF? I turned them down. I laughed and just put it away.
A few months later I check on my credit score and saw it had dropped. I asked why, they said it was due to a couple of inquiries (the auto dealer's banks) and most importantly, a lender turning me down. I asked how I could improve my score, they said I needed to get a loan and pay it per the contract because the only credit I had was CCs. Nope, not even a mortgage- I own my properties free and clear of any loans.
The interest on my CCs went up. No big deal because I always pay my CC balances in full every month, but still...
And then there's the credit reporting company's getting me confused with my father who passed away before I could get access to his checking account to pay his bills, but that's another story.
On the plus side, I don't get a mailbox full of offers for new CCs and loans that I don't need from banks.
Funny how when you need money, no one wants to loan it to you, but when you don't need money, they're lining up begging you ta take it.