I think you picked the wrong Pew Poll for your link. Try:
Little Support for Terrorism Among Muslim Americans | Pew Research Center
http://www.pewforum.org/2009/12/17/little-support-for-terrorism-among-muslim-americans/
The 27% number is the American Muslims who don’t believe that suicide bombing in the name of Allah is never justified or is sometimes or always justified. And in lots of countries the belief that it is sometimes or always justified is much higher.
While it is comforting to see that large numbers of Muslims think it is NEVER justified, it is disheartening to see that there are also large numbers who don’t hold that view.
And suicide bombing attitudes may have as much to do with arguments against suicide itself as the bombing part.
Thanks for that additional information wildbill