everyone is a terrorist you just need to push them ...
Not only history has shown that. But psychology and genetics can testify that being terrorist is a product of to many factors (including genes) that it is difficult verified for all the human kinds and every person.
A terrorist gene?
Sure. There are characteristics or personality as for example aggresivity or desire to kill that are genetics. No one can be killer if has not the genes to kill. To many people suffer but not are able to kill. Why? Have not the gene.... You think that John of ISIS have not the gene of the killer when beheading without any emotion the head of one innocent person?
Oddly enough, the factors pertain more to environment than genes. The CIA spent millions of dollars on trying to reprogram humans into ideal interrogation subjects, as well as "instruct them" to be assassins. Google: "MK Utra"