If you're whacked off your t1ts on drugs then you probably won't give a monkeys about anyone else....
I imagine this was the case with the woman who cited 'stress' as the only reason for her actions, yet the ambulance driver states her and friend were laughing and gesturing - doesn't sound like 'stress' to me.
Unfortunately we created this society with our namby pamby punishments and lack of any sort of accountability, and now we're stuck with it.