"In a [previous study of mine] assessing terrorism's coercive effectiveness, I found that in a sample of 28 well-known terrorist campaigns, the terrorist organizations accomplished their stated policy goals 0 percent of the time by attacking civilians."

You are looking at it from the wrong angle, you have to see the perspective of the puppet masters.

Take 9-11: it accomplished it's policy goal, which was to give a justification for spending trillions in a bogus war on terror and to curtail civil liberties in the USA. Of course this only makes sense if you question the official story and start to look behind the curtain. Btw, I don't even believe there were any terrorists on the planes, who were in fact remotely controlled.

Once you see the pattern you will recognize it everywhere where significant terrorist activity is performed. Israel NEEDED some rockets to be fired into it's territory from Gaza to have a justification for the invasion. Now, I'm not claiming that those who fired rockets where necessaryly Israeli agents or collaborateurs, but Israel provokes these actions. Don't forget that Israel was the one who created Hamas in the first place.

These are just two examples, there are whole books on this topic. Keyword: False flag operation.