In 2012, Ciccolo was photographed taking a peaceful stance against nuclear energy. What happened between then and now to cause him to want to kill people?
More...http://thefreethoughtproject.com/son-boston-police-captain-arrested-terrorism-ties-isis/#Wv7eklR2AY7Ams3W.99
Well, what did cause him to want to kill people indiscriminantly?
It does seem by contrast, that someone such as a serial rapist/murderer is more rational.
However before shrugging off such a personal as "crazy" two things should be considered.
1. Is there collaborating evidence in his life that he was crazy? Relationships or lack of, jobs or lack of, other things he said or did? The question is not did he repeatedly say he was going to kill people, but whether he said crazy stuff. For example, "I am Napoleon."
2. Was he on anti-psychotic drugs?
In short, one might question whether the "violent Muslim virus" is particularly capable of infecting those on anti-psychotic drugs, or those who are clinically psychotic, or clinically depressed.
Worth considering...
The brain is a computer (at some level). Learn a whole holy book by heart and it is computer programming.