Not all terrorists are jihadists, some are just very angry members of the society they target. Think Timothy McVeigh in Oklahoma City, or Anders Behring Breivik in Norway.
Now it is Poland's turn to catch an angry Pole who was ready to try to destroy the Polish government with explosives. See the article in The National Interest, hat tip to RealClearWorld for the link.
With the U.S. population over 300 million evenly split politically, and some very angry partisans on both sides, it's a wonder we haven't had more domestic terrorists here.
