It's a recruitment tactic mostly, they all know that it happened, but they hope they can reach those who pride themselves on being open minded by saying "What if it didn't?" or "Hey, they seem to get REALLY made at people who are just harmlessly asking questions?"

So that they can be "Heard out", and hope to indoctrinate you.

This tactic sadly works, and it's why you can't just "Debate them and challenge their idiocy in the free market of ideas."

They simply won't play the game fairly and in good faith. An honest debate is between two parties hoping to better make their positions understood, but if you're not honest about what you believe in or why, the whole process has the rug pulled out from under it.