I understand you're wanting to do that. You could try it, if you feel that's something you must do.
I still find it hard to know what the right thing is to say at times, or if I should say anything at all, because everyone is different, reacts differently, etc. While some might be willing to hear your thoughts and suggestions, others might feel put out by it...especially if they didn't ask for opinions in the first place.
It's a judgement call. I would only suggest that if you do it, keep your true motive in mind at all times. Saying it once and then letting the outcome go is one thing. Expecting results or for them to stop enabling is yet another.
Good luck in what ever you decide.