Why are parents so intent on stopping their son/daughter fro committing suicide when they're in pain from something like depression?

Anonymous
When my Grandma was sick and wanted to die I was sad but unlike parents who send their suicidal teens to mental hospitals I'm not selfish and wouldn't want someone to live in pain for my sake so I understood when they decided to pull the plug. So I don't get why when parents see their child suffering that can't learn to let go and allow them the dignity of death instead of being locked up and treated like a rabbid dog?
Why are parents so intent on stopping their son/daughter fro committing suicide when they're in pain from something like depression?
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