Then again if you can afford your debts and if borrowing is improving your life then there isn't really an issue?
The issue is, i think, that life changes and what was previously an affordable debt can become unmanageable.
I'm certainly no stranger to unsecured debt, my education cost me £32k personally, all borrowed from banks, and that's before the interest started ticking (started in 1999 and it was 2005 before my first repayment). I was fortunate enough that my investment paid off, but many of my peers weren't so lucky and are now trying to pay back a crippling debt on an average/below average salary.
You're completely right though, there is no issue at all with properly managed debt (most businesses for example couldn't function without it). It's just that it doesn't take much for things to go pear shaped at the moment.