On some level, people want to be lied to...they want to hear what they want to hear and they are quite prepared to punish anyone who (for whatever reason) bursts their happy little bubble.
So....
If someone asks you directly for your advice or input...give it but give it sparingly. Answer only the questions they ask you and nothing more.
If your motive is to prove a point, vindicate yourself personally or to get retribution for the wrongs you suffered....keep your mouth shut. A mind changed by force is a mind unchanged.
If someone is in imminent danger....say something otherwise, it's not your job to save or enlighten the world. That's an old JW notion.
When the student is ready....the teacher will come.