It was mentioned earlier in the thread that cabin crew are not trained to deal with ice. Well here at BA we are advised about ice and how it affects lift every year during the CRM content of our SEP.
And personally speaking I have a PPL and a family to return home to.
What we don't do, obviously, is make the decisions. I'll speak for BA, every time that I have witnessed my colleagues contact the flight crew, and every time I have contacted the flight crew about a possible issue, they have taken the time to come and investigate and provide an explanation and reasurance.