Firstly, it is only another two weeks until the ECB meets again to decide on interest rates and a fortnight is neither here nor there in macroeconomics.
Other than the false credence this assigns to the pseudo science known as macro-economics, supply side principles seem irrefutable: lower tax rates motivate production which spurs economic growth thus expanding tax revenues.
As he taught his students about theories and macro solutions to global economics, a very real, very tangible problem was literally starving people to death at the doorsteps of his university.