... Are you applying the same standard of knowledge and understanding to your average secular or Christian man in the street when it comes to their own religion that you do to one they don't even practice? If not, why not?
Instead of religious canon, think in terms of political dogma. In this realm of analysis, there is no difficulty in distinguishing between the extremes of laissez-faire and totally authoritarian postulates among the various approaches. There is also no difficulty in assessing the relative grasp among followers and those living under the regimes of what the ideologies preach, and the degree to which those postulates are actively practiced. So, for example, while we may consider totalitarian ideologies oppressive, there is no reason to believe, say, all residents of Nazi Germany or the USSR were, even when formally subscribers to the dogma, aware of or diligent in practicing their precepts. We may also identify those individuals who most act in line with them. In all cases of totalitarianism, we can state that the ideologies do not respect human rights, and when in power, suppress them. A few good apples do not save the bunch, and are examples of the free variation of individual responses, not of the ideology or what it teaches.
The same is true, of course, for non-authoritarian ideologies, such as democracy, under which we can identify both the Lincolns and the Trumps, the good-faith voters and the vote suppressors. The bad apples do not indicate the ideology preaches what they practice, only once again, we can note the variation of responses.
I think you have the point by now. Anecdotal individual behavior is not indicative of an ideology; it is the formal postulates that indicate what actions and central tendencies those who follow a given canon will have. And the homework you are missing is the evaluation of Islam - the religion -
as preached and exemplified by its prophet. Those
same examples of behavior are what those fleeing from Mosul, today, cite when interviewed as the
horrors of ISIS.
Dogmas: evaluation is/should be based on the actual teachings/canon.
People: evaluation is/should be based on our common human nature.
By scrutinizing these issues, you will be quickly afforded an insight into exactly how and why those who are living normal, comfortable lives in the West (or in an Islamic country) who start to practice the faith as its prophet indicated become terrorists. The problem: Islam. Islam, a tribal canon preached by a warlord who slew his opponents without mercy and made himself, alone, sole arbiter of all things past, present, and future. Think Trump, and you get a much better idea of his "qualities."