It’s all about control.
If you want the other side to default, you start with insults.
Obama is just doing what any Muslim would do, burning down the house.
To Obama, politics is a bare knuckle blood sport. The concept of the leader of the nation having a sense of decorum, trying to bring people together for the common good, is foreign to him. He delights in offending his opponents, rubbing their nose in his excrement, and then ultimately getting his way. His boorish behavior has not impeded his political success, why would he change now?