[tonyz]

A snippet below from the NPS thesis that JJ posted above - appears that a reasonable reading might apply to Radical Islamists and the world in which they operate, as well.

INSURGENCY IN THE HOOD: UNDERSTANDING
INSURGENCIES THROUGH URBAN GANGS

"Passive support is common in any community. Individuals do not see an associated evil with inaction. In contrast to this sentiment that there is no evil in inaction, the street gang and the insurgency both rely upon passivity to maximize their benefits. Passivity is a form of endorsement. Communities do not see their inactivity as contributing to the problem, but to the insurgency and gang passivity is a tool. The gang or insurgency must secure community passivity to ensure authorities cannot collect intelligence on the illegal activities of the group."