You also have to look at what the private sector is doing. When the private sector won't borrow, the public sector has to, otherwise the money supply is destroyed. That's why QE didn't cause inflation. There is a case for public sector borrowing right now because the private sector isn't borrowing. But you'll never hear tories speaking like this, even if they think it, as it shows how the public/private sectors are intimately dependent upon one another.
Some of this stuff is counterintuitive, I think. You might think that household borrowing would increase during bad times, but actually the opposite is true - taken as a whole, people borrow when they are optimistic about the future and save when they're fearful about it.