If we open the Old Testament of the Bible, it tells us to murder our children, if they are disobedient. So, most Christians read this, then interpret this (however they do it) and decide that these instructions do not apply to them, and they ignore this command.
With the Koran, it instructs the Muslim to slaughter the Infidel. So, most Muslims then interpret this (however they do it) and decide that it does not apply to them, and they ignore this command.
When Osama bin Laden kills Infidels, it's not because he interpreted anything, it's because he read the Koran and it told him to do so. It's there in black and white. No interpretation is needed. (It would be exactly the same scenario if a Bible-believing person stoned their child.)
I understand your post better now. Thank you :) However, there is some correction. Muslims do not see any portion of the Quran as not applying to them; they might, however, see it as applying to a different time (Mecca/Medina). In like manner, a Christian may dismiss literal sacrifices as applying to a different time period.
As for bin Laden, you are absolutely correct about the black/white dichotomy. Interestingly, Wahabism originated in a very black/white location. The land had few colors, even the predominate musical instrument had only one string. Their black/white Quranic interpretation motivated this sect to destroy the Graves of the Companions and murder many muslims; the Ottomon caliphate had to intervene to stop the slaughter. Like JWs, they just put them in the apostate column (for worshipping under the trees), which then made it an honorable action to kill them.