I would argue that Labour has no choice but to spend because the conservatives cut public services back to the bone. If you're going back as far as the 70's lets not forget Thatcher's absolute contempt for the working classes of this country.
Austerity was based on the myth that what caused the national debt was high public spending when in fact it was a global financial crisis. The idea that they had no choice is nonsense. If they had no choice, why are they now promising to spend on hospitals, police etc (which they haven't bothered to cost at all by the way), when the national debt is worse than it ever was when they came into power?
If having a tight grip on public finances is so important, why are the conservatives spending £8bn on tax cuts for people earning over £50k a year?
This is after Osborne took £8.6bn out of the public coffers by reducing the taxation rate in 2013.
The IFS has also said that under Conservative leadership, the poor have been hurt twice as badly as the rich financially.
It is their ideology to strip back the state and give the money back to the wealthy.