“like a judge throwing out certain evidence in a case merely because it appears to complicate the crime.”
My view—as you know—is the analogy would be the judge throwing out certain evidence to protect the guilty.
Actually, that's probably more the case than what I suggested.
That said, I know a lot of people involved (not from the government) who prefer to stay away from what they call "the Woo" for relatively innocent reasons (they believe it complicates an already extremely complicated and scary issue).