Isn't that obvious?
Because it would end the outbreak faster, and let everyone go back to work sooner!
Because if we botch this thing and force too many people back to work, we'll prolong the outbreak, force more businesses to stay closed, and we'll need to do another round of stimulus later!
They're dumb about economics. They're dumb about public health. They're a party of dumb, greedy, short-sighted people who only think about me, me me, and they often suck at doing even that.