I tell my kids this - you can tell people till you're blue in the face that there's an alligator in the river, and a surprising number of people will ignore you

I tell my kids this - you can tell people till you're blue in the face that there's an alligator in the river, and a surprising number of people will ignore you until they themselves see an alligator in the river. It's just how people are. It is very hard to learn from other people's mistakes.