If he's our guy (D or R), he must be innocent. Facts don't matter. The accuser must be crazy/a liar/part of a conspiracy.

Examples: Bill Clinton, Donald Trump, Brett Kavanaugh.

There are some exceptions. When the evidence is overwhelming - like with Harvey Weinstein - society will condemn the predator. Otherwise, it's "if he's our guy, he must be innocent".

And that's what the predator counts on.