Does being a friend mean you support your friend's choices even though they are making choices that may not be what you consider to be in their best interest or the best choices they could make?
I'm not saying lying down and just accepting those choices. I don't mean just passively accepting what they do without ever talking with them about it. I think I mean they make a choice... you may say your piece... they have disagreed. Should you continue to support them even though they've continued down that path? I'm mostly referring to choices that don't really impact you. I do recognize that there can come a point in a friendship where what they are doing is too self-distructive to continue supporting that behavior and it becomes too hard for you to be with them and watch them destory their lives. Believe me I know that.
We briefly discussed this at dinner yesterday and I was roundly shot down. I think if a person is your friend, you should support their decisions. You can disagree with them, but really being a friend means (to me) putting your feelings aside and supporting your friend as best you can.