Why would he or anyone else question whether something occurred just because it's rare? You don't rule out something happening just because it's rare. That's how the iceberg sunk the Titanic. He wasn't implying at all that we should question whether someone was really raped or not. That's a huge stretch of his statements and nowhere near the realm of the discussion they were having.
I don’t know why he would. He just did.
It is true that it is nowhere near the discussion they were having ... which makes the statement all the more stupid. He answered a question he wasn’t even asked.
SnakeDoc