the most simple thing is that people commit horrific crimes all the time. Psychos, serial killers, criminals, etc.
The simplest thing is that Muslims do not mind such crimes, and such crimes are not persecuted or denounced in many Muslim countries and/or by the essential part or may be the overwhelming majority of Muslim clergy blossoming in Muslim and other countries, - including the US and the Western Europe, when such crimes are persecuted and denounced by any other civilized human being, - Christian, or Jewish or whatever.
Stating facts about Islam or anything else does not mean demonizing Islam or anything else. People who try to impose that it is not Islam but tribal culture of some unnamed and hypothetical tribes do not make a little of sense, because it has been pointed many times that this culture of Islam blossoms not only in unnamed and hypothetical rural tribal areas, but right here in the US, and in Europe and everywhere where there are societies of Muslims.