For the same reason it's (probably) baseless for a coworker of yours to claim you've been embezzling millions from your employer for years. It's basically a false accusation.
It's not baseless to claim voter fraud when you have proof. It's baseless when you claim voter fraud without any actual proof.
>If anything this will chill future concerns and people will not speak up. It sounds like you don’t want anyone to ever question a vote.
It sounds like he expects the President of the United States to act with the integrity the office commands. Not ask/condone/allow his lawyer to lie on television (where he can make up any lie he wants) while admitting there was no fraud in court (where he's actually held legally accountable for his statements).
https://www.salon.com/2020/11/18/judge-cancels-fraud-evidenc...