It is common for Muslim sympathizers to claim that almost no Muslim is a terrorist. However, public opinion polls in arab nations or among arabic popluations show large support for terrorism.
Muslim Opinion Polls
NOP Research: 1 in 4 British Muslims say 7/7 bombings were justified
People-Press: 31% of Turks support suicide attacks against Westerners in Iraq.
YNet: One third of Palestinians (32%) supported the slaughter of a Jewish family, including the children:
World Public Opinion: 83% of Egyptians approve of attacks on American troops.
68% of Moroccans approve of attacks on American troops.
90% of Palestinians approve of attacks on American troops.
72% of Jordanians approve of attacks on American troops.
World Public Opinion (2009): 30% of Palestinians support attacks on American civilians working in Muslim countries.
Pew Research (2010): 15% of Indonesians believe suicide bombings are often or sometimes justified.
34% of Nigerian Muslims believe suicide bombings are often or sometimes justified.
16% of young Muslims in Belgium state terrorism is "acceptable".
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).