Has terrorism ever succeeded in it's goal to deter a people from their beliefs?

I am no history scholar but it seems to me that terrorist attacks never seem to ever dissuade the attacked from their beliefs thereby allowing the terrorists to “win”. Car bombs, suicide bombs, multiple bombings of WTC, Hitler, Soviets has anyone ever succeeded in turning a people to the terrorist view point? Even the Crusades failed. With so much failure why do terrorists continue to use such tactics?