I think the problem is people don't really understand the problem deeply enough. There are far to many variables in the real world, and saying I went here with it switched on proves it's a crock.
Any one who has anything to do with RFI testing, arrays etc know's how pervasive RFI is, even on sheilded structures. Any single instance may not cause an incident, it could be any number of factors lining up in a row at a particular time that creates a problem.
We fly on aircraft that have been designed for extremely low statistical failure rates, going flying with your mobile on doesn't even approach being scientific method of proof.