not sure how one is to accomplish convincing the employer to discuss the matter since the employer is not posting here but, if the employee wishes to attempt to discuss the matter, of course, I see nothing wrong with that, as long as s/he understands that they have no right to demand to see the document. If denied, the employee will have to decide what to do based on that. It will go no further than that.
and yes, I know where you work so, what would you do if every single employee came to their bosses offices and said; I want to see our liability insurance policy to make sure I am protected if an attendee of our "business" (attempting to maintain some privacy due to issues you dealt with in the past) should be injured while I am helping them in some way. Would you be willing to hand it over to every employee or would you attempt to reassure them they are protected, even taking the time to discuss the specific concern but not provide the document as in the end, it really provides no answers the employee could use to determine if they are protected adequately?
but if it comes down to it, the employer has the right to just say no.
and honestly, if I felt I was at risk, I wouldn't work where I was and even reading their policy itself really would not provide any real answers. There are simply too many variables of situations possible to determine if I was really protected in anything other than a few very specific matters.

