So, "no one should ask" a suicidal person to not kill themselves "or force them" not to.
It is when people cannot fight for themselves that those of us who can fight have to fight even harder. I am saying this as someone who has attempted suicide twice.
You are literally arguing in favor for shrugging your shoulders to things like slavery.
No one should ask a suicidal person not to kill themselves.
If you believe in autonomy, every human has the right to decide when and how to end their lives. Slavery denies human autonomy by taking all control away.
Even when you think their decision is a bad one, it’s their life and their decision.
Asking isn’t forcing. And people who are suicidal are often in an unhealthy state of mind that doesn’t persist over an extended period of time. And we obviously place limits on autonomy in all sorts of ways.
Suicidal people are in a broken state, overcome by emotions and irrationality. When over that they’ll likely thank you for stopping them and likely to not understand themselves what the drive to kill themselves was except for remembering how cloudy they felt.