If someone you know is going to make a decision that could possibly put their life in danger, you should be a good person, step in, and prevent them from making that mistake. You shouldn't interfere if it is a decent decision that has absolutely nothing to do with you.
I do not believe that anyone has the responsibility to help anyone, however, it does depend on the situation. For example, when someone repeatedly chooses to do things that make them unhappy it is their responsibility to help themselves because they know they won't be happy with their descision, yet they make it. If they reach out and ask for help it is okay to help them, but if you have your own life to deal with then focus on you, because everyone has their own responibilites to deal with and you need to be your priortity.
A centrally planned economy oppose these basic economic characteristics- Property owned by private individuals, Market pricing determination by supply and demand forces, encouragement of competition among the companies and providing a wide range of choice to consumer.
