I think that the two BIG words here are "speculation" and "interest" !
Speculation
What I mean by that is that the "speculators" that play games with OUR money, whether this money is in pension-funds or in our savings that have been moved sideways so as to get them into the money-markets and stock-markets, has been so injected into those "pyramids", that Caminito talks about, that so long as there is growth and these pyramids don't collapse our money will be safe.
After 2008, we now know that our money is NOT safe in their reckless hands.
Interest
It seems that even when countries lend to each-other they like to screw the interest charges in proportion to the amount that is owed and the risk that is attached to the debt and THAT, if nothing else, is what is bringing a lot of these previously-viable countries to their knees.
I cannot see why they cannot play fair with the interest charges so that these large debts don't get unmanageable !