Libertarians pose the most threat to the establishment. Because we seek to undermine the very foundations of political power we threaten the establishment not with mere change but with annihilation. Politics is a power game where the winners impose their plan on the populace by force. Whoever wins, the game continues. But when the libertarians win the game is over.
Nobody imposes their plan on the populace by force.
Churches hold great power and wealth but it is all based on faith. If Sunday comes and nobody goes to church the game is over. Less obviously government is also based on faith. If one day people stop believing in and obeying it the game is over. Libertarians are working toward that day.