The following data is taken specifically from here:
http://www.thereligionofpeace.com/Pages/Opinion-Polls.htm
And is a small snapshot of all the polls and data listed. See the link above for the complete list.
World Public Opinion:
61% of Egyptians approve of attacks on Americans
32% of Indonesians approve of attacks on Americans
41% of Pakistanis approve of attacks on Americans
38% of Moroccans approve of attacks on Americans
83% of Palestinians approve of some or most groups that attack Americans (only 14% oppose)
62% of Jordanians approve of some or most groups that attack Americans (21% oppose)
42% of Turks approve of some or most groups that attack Americans (45% oppose)
A minority of Muslims disagreed entirely with terror attacks on Americans:
(Egypt 34%; Indonesia 45%; Pakistan 33%)
About half of those opposed to attacking Americans were sympathetic with al-Qaeda’s attitude toward the U.S.
http://www.worldpublicopinion.org/pipa/pdf/feb09/STARTII_Feb09_rpt.pdf
Pew Research (2007):
26% of younger Muslims in America believe suicide bombings are justified.
35% of young Muslims in Britain believe suicide bombings are justified (24% overall).
42% of young Muslims in France believe suicide bombings are justified (35% overall).
22% of young Muslims in Germany believe suicide bombings are justified.(13% overall).
29% of young Muslims in Spain believe suicide bombings are justified.(25% overall).
http://pewresearch.org/assets/pdf/muslim-americans.pdf#page=60
Pew Research (2011):
8% of Muslims in America believe suicide bombings are often or sometimes justified (81% never).
28% of Egyptian Muslims believe suicide bombings are often or sometimes justified (38% never).
http://www.people-press.org/2011/08/30/muslim-americans-no-signs-of-growth-in-alienation-or-support-for-extremism/
Pew Research (2007):
Muslim-Americans who identify more strongly with their religion are three times more likely to feel that suicide bombings are justified
http://pewresearch.org/assets/pdf/muslim-americans.pdf#page=60
The Polling Company CSP Poll (2015):
19% of Muslim-Americans say that violence is justified in order to make Sharia the law in the United States (66% disagree).
http://www.centerforsecuritypolicy.org/wp-content/uploads/2015/06/150612-CSP-Polling-Company-Nationwide-Online-Survey-of-Muslims-Topline-Poll-Data.pdf
The Polling Company CSP Poll (2015):
25% of Muslim-Americans say that violence against Americans in the United States is justified as part of the “global Jihad (64% disagree).
http://www.centerforsecuritypolicy.org/wp-content/uploads/2015/06/150612-CSP-Polling-Company-Nationwide-Online-Survey-of-Muslims-Topline-Poll-Data.pdf
83% of Palestinians approve of some or most groups that attack Americans (only 14% oppose)
How do you poll a group that doesn’t exist?