alt Hacker NewsRight, part of his whole pitch was that he had a new cutting edge gene therapy that was more precise than CRISPR. I think the parents were definitely obsessed with "fixing their daughter", but it seems like Qiu didn't try at all to "snap them out of it" by mentioning how the treatment he was attempting could also kill her.
Of course he didn't try to discourage them. He wanted to do this type of research/experimentation, which is almost certainly why he was known to the communities the parents were a part of (the article says the parents learned of him in a "WeChat group in which parents of children with autism and similar disorders trade advice").
This is a form of doctor shopping. If you really want something, you can find someone who is willing to provide it, even in fields like medicine where practitioners are expected to adhere to rigorous ethical standards.