Situation critical

What do you do as a morally responsible person when someone is choosing risks in their life that will impact your own and others in a negative manner?

Where is the boundary between caring and interfering?

How does it happen that cracks in the system turn into chasms with noone ever looking around in awareness?

Grandmaster Flash and the Furious Five were right---

Dont push me, cause Im close to the edge
Im trying not to loose my head
Its like a jungle sometimes, it makes me wonder
How I keep from going under