The problem is that the population of the US is itself polarized, and different factions want the government to be doing extremely different things with its funds. If faction A has successfully gotten the US federal government to fund something for a long time, and faction B hates that thing, campaigns on ending the funding, and then does end it once they win an election and take power - then a demand for the US to not play gotcha games with its funding is isomorphic to a demand from political faction A to keep some of their preferred policies in place even though they are not currently in a position of electoral power.