I think that is the problem. Where as a house fire has never been a fear of mine as I know how to use a fire extinguisher and practice safety in the kitchen with my kids. Note: I never knew anyone involved in a fire personally.
Now my sister, who used to work in the tv industry, did a news story on human trafficking in America. It is on the rise and what happens to those kids is not a risk I am willing to take with my kids. Is it a low/high risk at WDW? Well, I think that's for every parent to decide themselves. I know for myself if something did happen statistics would be little comfort to me. Now am I dragging my teenage boys in the bathroom with me of course not.

But a 9 YO girl left alone well for me that's different. Will I have to let her try her wings eventually, of course. IMO that won't be at 9 in WDW. I don't judge those who would so I expect those of us,who disagree, should get the same courtesy.