How was Chögyam Trungpa's behaviour justified by his lineage?

As well as being a preeminent teacher of Tibetan Buddhist, Chögyam Trungpa was notorious for his more extreme behaviour such as drinking, smoking, sleeping with students, crashing cars and so forth. While this seems unusual behaviour for an advanced Buddhist practioner I was told that senior figures in his lineage (Kagyu and Nyingma ) and were very comfortable with his actions. So how were his more controversial actions justified by others within his lineage? Is there a tradition within Tibetan Buddhism which encompasses seemingly unethical behaviour? Was there any precedence within his lineage for this kind of thing or was he just a very unusual character?