The Wikepidia article you are citing has a warning message for bias.  Here is a better and more encompassing link which includes more than one detail that you seem to be cherry picking (it cites another poll saying 72% Muslims worldwide disagree with such violence - not just the US but form the entire planet).

http://www.pewresearch.org/fact-tank/2017/08/09/muslims-and-islam-key-findings-in-the-u-s-and-around-the-world/

If you truly feel that nearly half of all Muslims believe that violence against others is justifiable then you have a real bias for the truth.