Borrow-and-spend has been the Republican philosophy since Reagan. Cut taxes only for the rich and then brag that you cut taxes. Borrow money like it was going out of style and use massive increases in govt. spending to stimulate the economy, then take credit for stimulating the economy. As for the debt, just pass it on to the next president. And when your massive overspending and huge debt increases bring on a recession, blame that on the Democrats.
I don't think most of Trump's 'base' even thinks or knows or cares about the economy. They want to Keep America White. They want the border wall, even if it doesn't actually DO anything. They want blacks and women and immigrants and minorities kept in a second-class citizenship. The economy is too complicated for them. Fox and right-wing screech radio has marinated them for decades in white-hot heat of anything Democratic, so they'd rather have the most dishonest, most incompetent president in our history than a decent Democratic president. They've made that decision twice in a row now, in 2000 and 2016