As I've said before on this thread, those asking for evidence ignore what's put in front of them and segue to another topic. This is what argument from ideology does.

There is no amount of evidence that will convince people whose agenda isn't what they claim it to be. It's the whole point of their position. They present fake facts from biased sources and tell you, "See!?"

When that point gets brought up, the response is to find a new segue or a way to attack.

The best approach, I think, on a forum like this one, is not to engage them.