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If we deny Islam its religious protections, we would be better positioned to defend America.
Communism (a close cousin of Islam) has no such protections and can be, rightfully, derided as anti-American.
Communism is constitutionally protected under the First Amendment, freedom of speech.
If you’re referring to the Smith Act, it was ruled unconstitutional by the SCOTUS in 1957, though the law is still on the books.
Even if you re-classified Islam as a purely political group, political parties are still protected under the First Amendment.
There’s no need to resort to heavy-handedness in dealing with ideological opposition....the American system has it’s own unique way of ultimately neutralizing any truly radical sociopolitical movements. Why be a follower of Che Guevara when you can just buy a T-shirt with his visage emblazoned on it?
Besides, if you wish to deny Islam religious protections, you would have to either a)amend the Constitution, or b)open up a Constitutional Convention. Amending the Constitution is far easier said then done.....ask the supporters of the ERA. The second course I find distinctly unwise.
If you really want to neutralize Islam.....Americanize it. No greater disaster could befall Islam then for it to be turned into yet another homogenized American pop-culture artifact. Like Kabbala for instance. Get a few brain-dead celebrities to embrace the Americanized, watered-down neo-hippie-dippie version of Islam, and any revolutionary potential it may have will dwindle away to nothing in a generation or two.
As an example, think of what would’ve happened if the Roman Empire had simply made Jesus Christ just another one of the gods in their pantheon; over the course of a century or so, it would’ve likely faded into obscurity as just another sect or mystery religion. By persecuting the early Christians, the ancient Romans inadvertently spurred its growth.