It simply never struck them that anyone might care what they were doing a few years ago or look it up.
Either that or it’s the same level of privilege-driven arrogance that makes them think they won’t face consequences from the powers-that-be. It’s the same sense of invulnerability that arsehole couple in St Louis feel gives them the ability to brandish semi-automatic weapons at peaceful protesters on a public thoroughfare outside their house. Up until very recently it wasn’t a particularly dumb approach, given the number of free passes for antisocial behaviour that affluent white people were and are given by the police and by the corporations.