I agree with you, Fairydoll, and would also dispute Madamecholet's view that someone with a happy childhood will not need contact with estranged grandparents.
My mother would never speak about her parents, as she'd cut off contact in her late teens, before I was born. I loved my mother dearly, but she was a stubborn woman and I'll never know whose "fault" this was. I haven't even seen a photo of them, and would dearly love to have had at least that. Consequently neither my sister or I, none of my children, nieces, or their children, and so on ad infinitum, will know anything about this branch of our family. That's a big call for one person to make on behalf of us all.