What you want to learn about this? This are animals and they attack driven by their instincts. All Muslims act like this.
The leftists can't accept this. They feel there has to be another answer, even though there really isn't. It's like all the study groups trying to figure out why black students don't score the same as white students on standardized tests. It's not due to racism but because of a generally lower IQ among the black population, but liberals CAN NOT accept that as an answer, so they continue to waste time and money trying to find some other answer.