A pandemic seemed about as improbable then as an alien invasion. What should the government have cut instead? School spending? Social services? How do you think the voters would have responded? Remember that the budget deficit was enormous.
It's pretty hard to defend funding pie-in-the-sky ideas like global pandemics when people have concrete, immediate problems. Just a month ago, the concept of a global pandemic that would shut down a huge portion of the economy seemed insane to 99% of voters.