I am not as unsympathetic to that view as I may have come across Blanche. I just don't think it excuses every case (and certainly not this one).
One would hope that a doctor has an enquiring, analytical mind and above average intelligence. One would also hope that his intelligence and life experience (including a professional career in the west alongside different nationalities, women, etc) would offer a robust defense or counter-argument again the apparently hypnosis-like powers that would seek to radicalise him.
I would have much more sympathy for someone who (say) grew up in a village in Afghanistan, barely enough to eat, illiterate, chaotic family life, etc. I could more readily understand the desire for a better life and hope for some kind of "redemption", and that it would make him more credulous and susceptible to radicalization. (I once read that the men who drive suicide bombers to their targets swerve their cars around imaginary "hoora" i.e. the virgins waiting for the martyr and comment on how many there are and how beautiful etc. Dont ask me why only the driver can see them
)
We need to be circumspect about blaming those jolly clever imans or the forces of radicalization that operate in society in every case - the bloke who detonated the suicide vest is ultimately to blame, especially if he has the benefit of a good education and a supportive family (as so many have).