If we can just conjure up money from thin air (with apparently no guarantors) . Why on earth are we paying taxes. Why not quantitive ease all of the country's social needs?
Because if we did that there would be huge amounts of money floating around which would cause inflation. If the state is spending on things like the NHS, education, etc. it is paying out all the time. A huge outflow into people's pockets but what would they do with it once all the available resources had been purchased? It'd be like a burst water main, all gushing out but ultimately going nowhere.. Then we'd be in Venezuela, Zimbabwe territory...
Taxation keeps money circulating, and it also 'destroys' the excess money which would cause inflation. All money returns to the state, sooner or later, via taxation because all money based transactions are taxed, unless it's siphoned off into offshore tax havens.
trisher has explained the reason for 'austerity'.