HELLO I'M STUDYING A MASTERS IN ECONOMICS SO EXCUSE ME IF I RANT :(
I don't know how it works in the series- I mean, maybe the corporation is literally forcing everybody to take loans from them through forced purchases at extortionate prices in
company stores or something. But in most of the mordern-day world, the only people who get into debt do so voluntarily to purchase some big asset you normally can't buy on cash (say, a car, a house, machinery for a factory you are setting up, etc.). If hackers were to delete all those records, you'd get chaos, in three different flavours depending on how it goes:
a) the cancellation means the debtors get to keep the things they bought with their borrowed (not theirs) money and the lenders lose their money, meaning that the gain for the borrowers equals an identical loss for the lenders, and the lenders would probably refuse to ever lend money again, which would suck for the next generation of people who want to borrow money to buy cars or houses.
b) "the banks" shoulder the losses, unless they cannot, at which point the shareholders lose all the money they invested in the bank through no fault of their own and, if that is not enough, the Government (aka everybody) will have to bail out the bank, meaning everybody loses money. Oh, but the borrowers get to keep the stuff they bought with the borrowed money, at the expense of everybody else.
c) the borrowers get their debts cancelled and the banks/lenders get their loaned money back, at which point you get massive inflation, causing the value of all money to drop, making everybody else worse off (except for the borrowers yadda yadda yadda).
In general, I think hacking is equivalent to wiretapping and other sorts of illegal espionage, which really isn't nice. I mean, if we are talking about a dictatorial outfit called "Evil Corp" or "Republic of Evilonia" that needs to be torn down, it could possibly be justifiable... but luckily, we aren't there, so I'm sure there are other legal ways available to settle arguments.