Man is born in flesh that cause us to be easily self-righteous, which leads us to judging others, mostly on their disobedience towards Christ. The fact is that there are many things we do not know about them, such as their disobedience could be due to them being new in faith, their disrupted backgrounds or even poorly fed spiritual life. We really learn to humble ourselves and face God for the right directions to face them. The key is that we need to know that whatever we are able to do now, is all by His grace.