You have to denounce based on the fact, or correct information

If you have to denounce someone, then you should denounce him based on the correct information.

If you do it with incorrect information, then you will end up showing off your ignorance, or incapability/unwillingness to properly deal with the truth, and eventually you will lose your own credibility and the trust from the people. Those who care about you might advise you this point, but those who don't care might just praise you for your amazing wisdom.

Sad thing is that it is not easy to find people around who really care about you. So many just might want to utilize you for their own cause. Sigh...