That's why you need to be more sneaky about it.
In Denmark you used to be able to deduct interest 100% as far as I'm aware. According to
http://da.wikipedia.org/wiki/Rentefradrag
it's then been gradually decreased from 73% in 1987 to 32% in 2001. And there's a plan to decrease it further, although it is, as you point it, a really hot topic every time it comes up - "driving people from their homes" and similar headlines.