Thanks for all the responses guys. I am still wondering though, can US Customs at LAX or SFO stop you from entering the US though if you have unresolved debt? Can the IRS contact the IRD here in NZ to seize wages for unresolved US-debt?
With regards to morals and paying debt, well get this hilarious but true story. The day I left the USA for good (to move to NZ), I accidentally left my AT&T cel phone on the chair at LAX airport when I boarded the plane. I got to NZ and realised this and called them long distance to cancel my account due to the lost phone and moving overseas. I was past my contract date, so no worries there. However this is when the fun started.
AT&T told me that my final bill would be available to view/pay online in 1 day. But what she did not tell was that when AT&T cancelled my account, they also for some reason would automatically remove my online access to see bills.
So I called them and asked to have them mail me a paper bill to my address in NZ. They of course said yes sure. Well 2 weeks past by and I never got my final bill. So I called AT&T again on a long distance number mind you! grrr! They next person I talked to said their "System" did not allow them to put overseas addresses into the database so they'd mail me a handwritten envelope instead with the bill printed out on the inside. I said OK to that. Well 2 more weeks past by. Never received it. I called AT&T back to complain. The lady told that the balance was $120 or so, and just to send an payment in. I told her "no way, I need to see the bill first to check for errors, then I will pay it after seeing it!!!". She said that they had no way to get me the final invoice and to "trust them". I laughed at her and said, "you want to pay a bill without seeing it?? No way!".
I never ended up paying it afterall because the incompetent company could not even get me the invoice in my hand.
My overall morale in this is also what Victoria24 states. If U.S. Corp Execs are allowed to run companies into the ground/deep debt (where US tax dollars bail them out), and but they are still drawing their big $5million paychecks, then why should I feel guilty about a credit card debt I left back in the USA to collect dust?
Anyway, my "AT&T final invoice story" still makes me laugh. It cost ME money to call a long distance number to get an AT&T bill so I could have given THEM my money.
PS. In the USA, bad debt can only stay on your record for 7 years; this also goes true for bankruptcies as well.