jane -
I do agree about the complex emotional issues involved. However, with a genetic issue in my own family, I can state that I would definitely want to be aware of a "possibility in the future"
A different genetic issue was faced by my niece whose mother had breast cancer, and whose maternal grandmother died from the condition. There are various other instances within her family. My niece had an elective double mastectomy, once she had had her children, to avoid any possibility that it could occur for her. Her sister chose not to even consider the issue ..... and has been under treatment for breast cancer for the past two years.
That is not to say that either approach is right or wrong ....it is far too personal for that. I think one should be able to "tick a box" allowing for the info to be provided if found. This gives people a freedom of choice, denied them if health professionals take the stance that "it wouldn't be good for us to know".
In the 'bad old days' people were often not told a terminal diagnosis because it was not felt to be good for them. Attitudes and times have changed, and the concept of not revealing all pertinent results of genetic testing seems retrograde.
Just my spin