Sometimes it makes great economic sense for a government to borrow and add to the deficit. Say there is huge demand for a mineral that your country has huge deposits of. The problem is you can't export it in sufficient bulk quantities efficiently due to poor rail links and ports. The money to build this infrastructure has to be borrowed, but the profits in the future will be huge and far out weigh this. So a failure to borrow under these circumstances would cost the nation money. With interest rates at record lows, now would be a great time to borrow, instead of being forced at a later date when interest rates may be higher.
During the GFC, the one western capitalist nation to avoid recession was Australia. They gave every household a cheque for $2500 and told them to spend it, they also spent billions on infrastructure for schools. This maintained demand, kept unemployment at bay, maintained growth and Australia came out of the GFC in better economic shape than any other nation. Meanwhile, the USA and Britain did the standard austerity thing and all it did was to allow for the GFC to bite so much harder and to last for longer. Clearly the present lot are no students of history, because this was the same lame response as the Tories put the nation through during the Great Depression. Tories, they are so predictable.
Tories constantly argue for so called 'austerity' because it is all part of their aim of shrinking the state. You know as well as I do that they don't want too much government, so cutting spending is a way of accomplishing this aim. Driving down wages and conditions, the race to the bottom is the only solution these unimaginative dolts have for achieving profit. They are lazy, inefficient and reactionary too. They need to go. if this is the best that capitalism under the Tories can offer, then I want something else.