Suicide terrorism isn't the same thing as terrorism. I'd imagine that the study examines suicide terrorism in particular because they are trying to make this point to start with and set the parameters to include the Tamil Tigers. I don't think that a knowledgeable political science professor chose that 1980 date by coincidence, nor limited the study to 'suicide attacks' by coincidence. These are the results he wanted to get from the start and manipulated his parameters to get them. Which makes them pretty worthless, if you ask me.
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