I don't think that's a fair assessment. The US has certainly been running deficits for a long time but the deficits of the last 10 year have been much larger (as a percentage of GDP) [1]. Some other countries [the exception not the rule] have been more prudent with their finances. In my part of the world New Zealand has been running a surplus since 2015 and prior to COVID-19 starting Australia was due to have a small surplus this year for the first time since the GFC.
> Keynesian policies would be to try to offset a fall in aggregated demand by increasing fiscal spending
I guess you can argue that spending hasn't been Keynesian enough.
[1] https://tradingeconomics.com/united-states/government-budget