While I was in the ward, Mom told me "I don't want to be the mother of a son who killed himself". It's about ego, just as much as it is about maintaining some elements of familiarity for comfort. You're "supposed" to live until you're 88-years-old and pass away in a nursing home, so that Mom doesn't have a tragic blemish on the life she tries to curate for people. If we lose our battle with mental health, her parenting and support will be called into question as well, so it's in their best interest to keep us alive, no matter what.
Unfortunately, this means that our suicide will have to be planned alone and in secret. We will never get our parent's approval or blessing, no matter how well we articulate our suffering or reasons for wanting to die.