Like it or not the federal government is a significant part of the over all economy. People earn wages, business provide goods and services in support of sevices provided by the government like healthcare where government spenting support thousands of private sector jobs. Doctors, Nurses and the janator sweeping the floor.
So if we, in the middle of an economic crisis, decide that we need to take an ax to government spending. We have to except that we are in fact shrinking the economy.
There are plenty of things to cut but the time to cut is when the private sector in expanding.
Which is not now.