Those that are impressionable by religious power figures. I would have to say need to feel acceptance in some way. I myself only answer to God alone not a priest, nor a pope.
It is not that they are not condemned by those in the religion. They are but unfortunately by a very small minority. Not all Muslims believe in what the terrorists are doing either. Some condemn what they do again a small majority.
I look at it this way if we lived in a neighborhood where fear was rampant in that neighborhood. You may have one person speak out against what is causing the fear while the others cower in fear. The Middle East is the same way I believe. People live in fear they may not agree with what the terrorists do but they fear to stand up against them.
Maybe I am wrong but I don't think the terrorist are in the majority and from my readings it points to they are really the minority. Yet they hold the population in fear.
I do not live in the Middle East, but I live in a country whose capital of the mentality of the people is very similar: Brazil.
Here's happening with this neo-Pentecostals, equal (not only reached the level of there cuz there is still friction), but is growing along with violence, fundamentalist Protestant groups, and as it happens there (as in the East, and they blame U.S. Israel's problems) here is the same, only they blame the pro-freedom of gays, drug release, secularism, saying that the country suffers from violence, poverty and corruption because of lack of faith, and increasingly increases it is the group of religious fanatics.
A leader of a large church (one of Brazil's richest according to Forbes magazine) did a debate with a journalist from a program emtrevistas super famous here, it seemed that was the end of the World Cup, everybody was watching and most people idolize , as was done with the Islamic Revolution Ayatollah.
What happened in the Middle East is slowly happening in the West (with more strength in Brazil and Africa).