His raid on Harpers Ferry was not a terrorist attack. His attack was not meant to cause fear. He just wanted the guns in the armory. He did not want anybody to die in the raid. That is what happened at Harpers Ferry and next is Pottawatomie.
His killings at Pottawatomie were not terrorist attacks. He gave the people he killed a chance to convert to anti-slavery. They did not thought so he killed them because they would not would not convert. Terrorist do not care who they kill ,and John Brown did