Couldn't agree with you more. Did you believe the 2017 tax cuts would pay for themselves?
I dont remember it being sold that way but I do remember the debate as to whether revenue would go up or down.
but to answer your question there was no plan to control or slow down spending in conjunction which is what was needed.
all they had to do was cap the increase in spending during that time not do the covid spending surge in 2020 and we would at least be balanced right now.
the problem as always is not enough voters care if there is a deficit but plenty do respond to the government throwing money at them.