[0] https://en.m.wikipedia.org/wiki/List_of_recessions_in_the_Un...
Not to necessarily disagree with your first points, but these latter two examples are "monetary policy" which is supposed to be independent of political processes and distinguishable from "fiscal policy" which is the spending of the US govt and necessarily political.
Also, as piker said, some of your examples confuse monetary and fiscal stimulus.
But about fiscal stimulus:
There was widespread fear of a recession in the early 1960s, which was part of Kennedy's motivation for more spending on Nasa and the military. Also, there were 2 tax cuts. The expansion from 1961 to 1969 became the longest in USA history, up till that time.
Reagan ran absolutely massive budget deficits, which lead a very long expansion, from 1982 to 1990.
If you overdo it you get inflation, that's why it's the typical central bank target.
Previous recession happened for other systemic reasons, like subprime mortages bubble bursting bringing down with it a lot of other things. Unemployment was more like a temporary consequence of that and necessary changes/realignment of expectations/allocation of money in the economy.
"How the Economic Machine Works" https://youtu.be/PHe0bXAIuk0
Increased (or trying to artificially increase) economic activity (as measured by GDP) is also not good by itself, but only in relation to meaningful demand.
Otherwise, digging and filling holes (like in a war, basically) would be an overally good thing, which it is not.
There's no need to increase spending via a central bank currency manipulation, just because it's lower than before, nor is it the only way to achieve that.
And money printing (lowering interest rates, QE, helicopter money, fiscal stimulus like New Deals or the likes of building the Hoover's Dam) is a generally acknowledged consensus on how to at least try to fix it. That is how to at least try to make people transact more.
Stimulus is already happening.