Do you think the philosophy of "Not my kid, not my problem." can be harmful?

Inspired by the children with jewelry post, because a lot of people commented "Not my kid, not my problem."

What I mean by this is there are some things that are potentially very dangerous that parents allow their kids to do, but people are so careful to not come off as judgmental or "mom shaming" that they just become apathetic and say it's not their business.

Like with the jewelry topic, it would be very easy for a child to choke if wearing a necklace, especially while not closely supervised or while sleeping. But people just say it isnt their business. I feel there's a point where we should speak up about stuff, and not just turn a blind eye.

Of course parents should always do what they feel is best for their kids, but what if what they think is best is potentially dangerous? Are we obligated to speak up or not?