If you borrow money, and you agree to pay it back, there should be a good faith effort to do so.
But that is only one type of debt.
In the US, where I live, Apartments are incredibly bad about charging fees after you move out, and give you very little recourse before sending you to collections.
Parking tickets, and red light camera tickets are huge sources of revenue for the city, and Seattle uses them when they need to increase city coffers.
I look at it this way, if they're not going to play by the rules, I won't either.
Also, I don't like paying for stuff.
I'm sorry for your loss. But this is why we should all strive to repay our debts... even to corporations[1]. I would imagine that some of your customers that stiffed you may have had the very attitude you described when you said "But from a corporation? Their losses are priced into their interest rate." They, too, may have assumed that your loss was priced into your rates. It must not have been. Perhaps other businesses don't either. It makes you wonder just how many people/business get totally screwed by people defaulting on debt to them. You suggested that chasing might understand differently if s/he had lost a business. Of course you are also entitled to your opinion. But, honestly, I'm a little sad that you don't see the other side of it, having been shattered by people not making good on their debt to you.
[1] I understand that Corporation ("big C") is generally directed at the big, huge things like Walmart and Chevron. But corporation ("little c") is just a legal term and can still be the small business down the street.
Unless you take things from people. People are different. Then you should pay for those things by bleeding all over the snow or whatever. (I don't know how money works in your country. In the US we usually just use dollars. There's not much snow right now and having everyone's blood everywhere can lead to public health problems. See also: Ebola.)
Anyway. Thank god there are no people at corporations. And thank god all corporations are the size of Walmart and can easily withstand financial losses due to non-payment.
Well, you should care, because they factor it in by increasing prices for consumers. You're just getting everyone else that shops at Walmart to cover your debt. That's irresponsible, and I see no difference between owing Walmart $10 and owing your friend $10.
This[1] is the type of situation where I believe the victims(yes, I'm using that word) deserve to have their debt removed.
1. http://www.npr.org/2014/09/15/347957729/when-consumer-debts-...
It is really a fabulous book, and can help explain why many people in many cultures feel as you do, who benefits from that belief, but also how debt has never historically been about moral obligations but has always been a contract between two parties, with limitations on both party's obligations.