In all the recent disasters in the last decade or so, I cannot recall one where people's lives were in any danger from roaming thugs etc. Aside from the slight unrest in Haiti, cities that were devastated in Christchurch, Australia, Japan, İzmit, Indonesian earthquake, NY 9/11 etc, many large metro centers were either devastated and or abandoned/evacuated in relatively peaceful order.

I would think that in my own country that it too would be a fairly safe evac through a devastated city, however that is not to say I would not keep situational awareness.

On the other-hand, resorting to Hollywood disaster flick plots and treating/planning our evac based on some wishful Walter Mitty-isque and thinking that the only way out is to fight or dream up group protocols to survive is not on my priorities list.