When Sen. J.D. Vance accepted the GOP vice presidential nomination in Milwaukee on Wednesday, it was a long way from an Ohio stage where he stood two years ago to defend his change of heart about Donald Trump. But his explanation at that March 2022 debate for why he’d gone from opposing Trump to being an outspoken supporter is serving him now as a perfect rejoinder to critics unhappy with Trump’s selection. And his words are something that should be heard by every Republican who thinks Vance isn’t loyal enough, every Republican who opposed Trump before his presidency — and even the NeverTrump…