The celebration in many Muslim countries that followed the Sept. 11, 2001, attacks has given way to broad disillusionment with mass killing and the ideology behind it, according to a number of polls.

Between 2002 and 2009, the view that suicide bombings are “often or sometimes justified” has declined, according to the Pew Global Attitudes Project, from 43 percent to 12 percent in Jordan; from 26 percent to 13 percent in Indonesia; and from 33 percent to 5 percent in Pakistan (excluding some sparsely populated, embattled areas). Positive ratings for Osama bin Laden have fallen by half or more in most of the countries Pew polled.