What can you do about a relative that is unemployed and only thinks of personal wants?

I have a relative my own age who is unemployed and never graudated school. While I am not one to talk due to suffering same problems, I at the least am wanting to find a job and to live frugally and self restrain on personal wants. By contrast, they seem to only want to buy material possessions and junk food that they do not actually need and throw tantrums at not getting their way. And even lose temper at the thought of having to work eventually. On one hand, they would probably not survive at all alone whereas they are a financial strain with no desire to change and improve. What should be done about them? Should they simply be thrown out and allowed to starve due to their own lack of desire to change ways or can anything be done?