It should matter for both
It should, but it doesn't. Trump is almost certainly a sexual predator, yet he was elected president, and the media seem to have largely made their peace with this instead of grilling him at every opportunity about the numerous allegations against him. It's extraordinarily unfair for them to run with this story and insist that Biden needs to answer for it while ignoring Trump.
I wish I could agree with you. Unfortunately the Left weaponized unproven sexual allegations politically in 2016 so it's a bit hypocritical to try to walk it back now.
I'm not walking anything back. I'm complaining about how, once again, Trump is being held to a completely different standard to other politicians. Hillary stumbles once and is helped back up - she must be secretly dying. Trump is obviously pressuring his doctors to lie about his obesity and disastrous physical shape (and even his height, because he's that petty) - nobody cares. Hillary uses an unsecured email account - she's tied up in Congressional investigations for years and forced to testify on numerous occasions. Trump and his inner circle do that exact same thing multiple times, and breach general security protocol in many different ways, both subtle and major, over the years - nobody cares. Biden seemingly forgets, or at least stumbles over, the beginning of the Declaration of Independence - he's a senile, doddering old fool who's too confused for the job. Trump regularly spews incoherent gibberish at public appearances, slurring over words with his eyes bulging out his head like he's on crack - nobody cares. A sexual assault allegation comes up against Biden, resulting in an unclear he-said she-said situation - this totally spells the end of Biden's candidacy, fucking Hillary should take the nomination now, might as well just reinaugurate Trump today. Trump is accused by over twenty women of sexual misconduct - nobody cares. It's ridiculous, and it will continue until the media put their foot down and stop letting Trump wriggle out of scandal after scandal.
Clearly it's to the American people to decide if the allegations against Biden matter, just as it was with Trump.
If they didn't matter for a candidate with over twenty accusations, then why would they matter for a candidate with only one?