There are obvious incentives and a huge, immediate payout for using voter fraud to overturn an election result. And voter fraud is an old, recurring phenomena - even if you only consider the history of the US elections[0].
On top of that, we're talking about an event from barely a month ago. The Russian collusion thing from the 2016 election went on for years.
While I would be astounded if the voter fraud investigations yielded sufficient evidence to overthrow the election results, you'll have to forgive me for not outright rejecting that potential. Of course, I would also be extremely skeptical if that did happen.
Besides, why do we have to be 100% committed to anything right now?
The US has become so incredibly partisan though, that both sides literally experience different realities. The same people that believe the pee tape is real will scream for censorship of Trump's lies and vice versa.
Are you also 100% not committed to the 1969 moon landing being an impossibility? Big Foot?
There's no evidence of wide spread voter fraud, there's lots of a wide spread fair election occurring.
The burden of proof is on the accuser, because "absence of evidence is not evidence of absence." To say you can't be sure fraud didn't change the outcome of the election at this point is ridiculous, and is exactly why youtube is banning such opinions.