Newsweek has an historical account of how the radical right moved from bombs to nullification. What they conclude:
... the problem with the GOP’s absorption of extremist rhetoric and goals is not that it encourages the violent, but that it obstructs the normal ebb and flow of politics. When politicians court a base that believes the federal government is the enemy, it becomes nearly impossible to negotiate. Judging by the gridlocked committee rooms of the Capitol, that metaphorical truck bomb has already detonated in the heart of the American political process.
h/t Phil Silvers