Here's why they are not being intellectually honest, and Manzi's post includes the relevant facts. The GOP has passed what amounts to a spending and tax-cutting and borrowing stimulus package every year since George W. Bush came to office. They have added tens of trillions to future liabilities and they turned a surplus into a trillion dollar deficit - all in a time of growth. They then pick the one moment when demand is collapsing in an alarming spiral to argue that fiscal conservatism is non-negotiable. I mean: seriously.
The bad faith and refusal to be accountable for their own conduct for the last eight years is simply inescapable. There is no reason for the GOP to have done what they have done for the last eight years and to say what they are saying now except pure, cynical partisanship, and a desire to wound and damage the new presidency. The rest is transparent cant.
This is the Manzi post in question: It's a critique from the conservatives, by the way.