I have on several occaisions met some hikers who are totally clueless and took the opportunity to give them some advice.

One time I was im the middle of an 11 mile day hike that is a loop and I met these people who had not jackets, flashlights or water. They asked me about directions and I told them that if they were planning on continuing in their current direction they would be out past dark and they would be in risk of getting stuck out. They thanked me and took my advice to turned back the way they had come.

But there has been other times when the advice is unwelcome.

I met a father and son at 13,000 feet on the Mt Whitney trail. The boy was showing serious signs of altitude sickness so I told the dad he needed to turn around and head down to a lower elevation. He did not listen to me until 2 other hikers insisted the same thing. He was putting his child in danger but wanted to summit Mt Whitney.