ARG! Universal dilemma: a friend is doing something that you think is bad for them. Be it a relationship or life habit or lack of job or whatever. And I don't just mean something that gets on your nerves, but something that you really, truly believe to be detrimental to their lives. Do you talk to them about it, try to convince them to change? Or just sit back and prepare to be there for them if/when it goes badly?