I think you have given too much credit to the Quran than what it really is.
- Islam is represented by the 6,236 verses of the Quran [words of Allah] and nothing else.
- A Muslim is a follower of Islam.
- To be a Muslim a person must enter into a covenant [a spiritual contract] with Allah.
- The Muslim’s obligation within the covenant is thus to comply with the relevant terms and conditions of being a Muslim within the 6,236 verses in the Quran.
- The Quran contain good and evil laden verses.
Here is a critical factor, note the following human perception in reality;
The Quranic verses, concepts and ideas are presented in such an ambiguous manner that make them vulnerable to a dualistic two-truth interpretations [like the duck-rabbit example above] where both different conceptions are true without doubts from the specific perspectives of the perceivers.
This is why when different groups of Muslims [20% evil prone & 80% moderates] read the same set [not individual verse] of verses from the Quran, the compliance of the 20% evil prone will turn out to be evil while the 80% of the moderates are indifferent to the evil laden elements.
Therefore the fault lies with the Quran which has tons of evil laden elements.
Wiser religions like the Eastern religions [who understand human nature very well] will never include evil laden elements in their holy texts that are presented in an ambiguous manner that can influence their evil prone believers to commit evil. Note Buddhism, Jainism, for example.