Well, it solves the problem of "I'm 25 years old with a decent paying job but no saved up capital, and need to buy <house/car/etc.>". Without taking on debt, I would need to save up for years to buy this stuff, but by taking on debt I can buy it now and "save up" (i.e. pay back) over the next years.
By all means, loans should be regulated in order to prevent people from taking on debt they can't afford, and to prevent/punish predatory practices. Debt in and of itself however can be a very good thing.
I have an apartment and a car now, with down-payments that I can afford without huge problems. Without taking a loan it probably would have taken me 25 years to be able to afford this. Except I wouldn't have, because the money I'm now using for down-payments would instead have gone to paying rent.