Just because an exact quantity of deaths prevented cannot be established doesn't mean it isn't tangible. Especially when we can view the infection rates of similarly situated first world countries who chose more aggressive policies with a much bigger financial support system and extrapolate. The numbers of jobs and businesses lost can definitely be quantified and are just as tangible.
Then you have things like the rebuke of the climate accord, the breaking of the Iran treaty, establishing a much greater degree of affective polarization in the population, and many more general assaults on political norms of decency that the full ramifications may not be felt for a while but are be very real. Much like the Republicans assault on public education over the last 40 years is now being fully realized with a completely stupid and ignorant average population.
We're not through being fucked over by Trump and the Republicans bullshit the last several years. Ain't through with us by a damn sight.