Oh look at you, using a dictionary! You missed the part though where words have multiple meanings.
You’re pointing at meaning (1), while Trump and his right-wing subs here were using the word “discredited” as meaning (2) - to “cause disbelief …”. Which means to cause through contradictory evidence. That hasn’t happened - there’s been no contradictory evidence. No person has said “it didn’t happen, and here’s why I know that, and here’s the evidence for why I know that.” THAT would be meaning (2) discrediting, and that hasn’t happened.
You are holding on to the notion that it was a false allegation. Right wing propaganda has done a great job the past week denigrating this woman and you have proudly taken your seat on the bandwagon.
There is such thing as a “good samaritan” law - but it doesn’t mean what it did in that Seinfeld episode.
Good Samaritan laws protect people who do choose to help from tort liability - for example, if you see someone choking and give them the heimlich maneuver, they can’t then sue you for breaking one of their ribs in the process.
Except in very specific situations, criminal law does not ever require affirmative acts to help someone else.