When we judge the behaviours of others we often attach labels that are "Good" or "Bad". When people are judged for being bad it is like a repellent for encouraging truth. People often lie because it is easier than being told they are wrong, bad, disappointing and having to deal with the emotional reactions of others hearing our own truths.

If you want total honesty from someone remove the need to judge them and learn how to regulate your own emotions when triggered without needing to blame others for your state of mind.