I agree the claim requires more evidence and it would be foolish to just take it at face value, but even if my intuition told me it was intrinsically safe I wouldn't place any degree of trust in my own logical conclusions, or discount someone else's warnings, however spurious.

The burden of proof should never be on the accuser when it comes to safety, in my opinion, or anything else of public concern. And the standard of proof should be higher to show that everything's ok than to show that it's not. At least in an ideal world.