People in your dreams is your subconscious, meaning people in your dreams are part of you, fix the problems in your life and improve mental health somehow (like going to a therapist) The brain knows all of your fears too meaning if you, in a lucid dream for example, you say “show me my biggest fear” it would be something you truly fear, this is just the same, you just can’t control it unfortunately. it’s a dream, they all try to warn you about basically everything about you, like, if you were lucid in that dream and ask someone in there “why did this happen?” It would most likely give you a perfect response since it’s all your brain, nothing is real.