The allegations against Justice Kavanaugh are from when he was in high school and college.
The allegations against Vice President Biden are from when he was 50 years old. They are also from 1993, two years after the Thomas-Hill hearings at which then-Senator Biden displayed his misogyny. Considering this timeframe, his assault on Ms. Reade can't possibly be construed as resulting from having no awareness of the issue of sexual misconduct in the workplace. They can be construed as the angry retaliation of an aging man against a world that he thought might change to reduce his privilege.
He couldn't know then how much things weren't going to change. All he could do was his damnedest to make sure they didn't change for him personally, which they haven't.