It's everyones responsibility to tell the danger that comes with the q/a. If a q/a is that dangerous and doesn't add anything, it should be flagged and by that removed.
When you give an answer you do so to the question, not the OP. Answerers should state possible injuries and such.
When you see a dangerous answer posted, add at least comment why it is dangerous. It's the responsibility of that answerer to delete it, edit it or leave it with that comment.
When I watch boats, I see miles away the mistake they are going to make. That's there responsibility. When I see it when they are in the harbour, would I tell them? Should I tell then? Of course but what if I told them? Sometimes they would like it and other times they're insulted.
People will drive too fast too at places they really shouldn't and you can't do anything about that, unfortunatly.
But a red disclaimer or dangerous stating if one answer wears this tag, it goes for all answers to that question. That way, experts, can add a safety warning easy. The tag should be written out in full at the FAQ too.