Recently, paleobiologist Olev Vinn has suggested that the great filter may exist between steps 8 and 9 due to inherited behavior patterns (IBP) that initially occur in all intelligent biological organisms. These IBPs are incompatible with conditions prevailing in technological civilizations and could inevitably lead to the self-destruction of civilization in multiple ways.
Mr Hanson too? This thread is a veritable whos who of extraterrestrial thought.
https://en.wikipedia.org/wiki/Great_Filter
I personally like where Olev Vinn went with it.