Gee, in the US, all property is debt as well. (Property tax.) So you don't really own your property--if you fail to pay, you will ultimately lose possession. http://taxation.lawyers.com/property-tax/when-you-cant-pay-y...
Let's say that in the US you buy a house, get a loan and your payment is $1000 a month. You make your calculations and think that you are ok for the next 10-20 years. You even have some slack and can afford a payment of $1200
You move into the house and the next day a new law passes and a new tax is introduced that will cost you extra $600 a month for the house you just bought.
How would you feel?
If the property tax in Greece was introduced in a gradual way complaints would be less.