Why do STRANGERS care if someone wants to commit suicide?

Anonymous
Ok I understand that someones family and friends care cause they know and love that person and don't want to live without them. But why do STRANGERS care? Whenever I mention somewhere online that I'm depressed and have suicidal thoughts people who don't even know my name try to convince to not do it ever, suicide is not the answer, say sweet, nice things etc etc. Why? I mean people die all the time. It's kinda my and my choice only if I want to put myself out of my misery or no. It doesn't affect strangers in any way, so why care so much? Or is it just politeness or a social norm maybe?
Why do STRANGERS care if someone wants to commit suicide?
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