Wading through the online debates, I note that opinions on stimulus are nearly 100% correlated with the composition of that stimulus, and the opinionator’s prior view of that activity. So when Democrats are in power and stimulus is mostly spending, liberals think that the stimulus is an issue of fierce moral urgency stymied by venal greed and rank idiocy, while conservatives develop deep qualms about budget deficits. When Republicans are in power, and stimulus consists mostly of tax cuts, Democrats get all vaporish about deficits and the income deficit, while Republicans suddenly realize that the normal rules don’t apply in an emergency. When out of power, both sides will grudgingly concede that some small amount of highly temporary stimulus might be all right, but note (correctly) that the other side seems to be trying to make permanent as much of this “stimulus” as possible.
For me, then, this mostly ends up as a proxy war over the level of government spending, a war I’d rather fight honestly on value grounds rather than attempting to disguise my preferences with a shoddy veneer of “scientific” logic.