Why are Christians people like this?

Look after yourself and don't search defects in others. Why they are like that? God surrounded you by people to direct you to Salvation. From spiritual point of view, the commandment is written only for you, and others are saints. Read more what Elders and Fathers of church are saying about this path.(St Anthony the Great, St Basil the Great, St. John Chrysostom (Archbishop of Constantinople), St. John Climacus, St. Gregory the Theologian and many others).