Twitter feeds move pretty fast. People might not notice a cry for help until it's too late.
If a person is feeling suicidal because the people in their life are not noticing their pain, I really doubt that knowing an algorithm had to do it will make them feel any better.
My friend posted a 'suicide note' on MySpace back in the day. He was a funny guy and everyone thought it was a joke about drinking too much. It wasn't.