Betrayed with a kiss

We all know that Judas betrayed Jesus with a kiss but do you know that Judas wasn't the only betrayer who betrayed a friend with a kiss?  Joab betrayed Abner with an act of friendship.  "Now when Abner returned to Hebron, Joab took him aside into an inner chamber, as if to speak with him privately. And there, to avenge the blood of his brother Asahel, Joab stabbed him in the stomach, and he died." 2 Samuel 3:27
But I wonder if we are not any better?  Surely we have betrayed our Lord with what would seem to be an act of friendship.  We say we will follow and obey but it is only on our terms.  When we run into obstacles then we turn away.