The word for today is self-radicalize. Becoming a terrorist on your own without outside influences, very popular term used to describe the Boston bomber brothers.
Thomas Sowell: There are no solutions, just trade-offs.
"The Obama Borg
How “man-caused disasters” replaced Islamist terrorism in the Obama lexicon
By Victor Davis Hanson
In Star Trek lore, the Borg was a collective of servile drone operatives that sought to assimilate other species into its “hive mind.”
Something akin to that creepy groupthink arose when the Obama administration took power and sought to reformulate the so-called war on terror. Almost immediately, Obama operatives suggested that radical Islamists were no more likely than any other group to commit acts of terrorism. In fact, the very idea of terrorism — not to mention a war against it — was supposedly a Bush-administration construct unfairly aimed at Muslims.
Obama apparently sincerely believed that there was no intrinsic connection between Islamism and terror; or, if there was, Islamic radicalism was no more dangerous than right-wing or supposedly Christian-inspired terror. Or if Islamic radicalism did arise, it might be mitigated by multicultural sympathy and outreach, mostly by contextualizing the violence as an inevitable result of prior Western culpability."....................