After the debate fiasco, the Party grandees decided Biden was unfit to run for president (although not, apparently, to be the president). The Harris campaign would only have suffered if he had been more visible. After the campaign, things like the Hunter pardon and his staff “not ruling out” a wave of prophylactic pardons for all and sundry would only seem to encourage the Trump gang to consider similar measures. It’s easy to see how any forward looking Democrat would want to memory hole the guy.