There's one huge difference between the Sepoy Mutiny/Rebellion of 1857 and America. The English were an occupying empire in their homeland.
It's never a bad to cut off the head of someone violently occupying and suppressing your country. The whole "consent of the people" thing. Especially when they are trying to keep you systematically disarmed.
"Among the many misdeeds of the British rule in India, history will look upon the Act depriving a whole nation of arms as the blackest."
- Mahatma Gandhi, "Gandhi, An Autobiography", M. K. Gandhi, page 372
LTC Dave Grossman is not overly knowledgeable. As Boris mentioned, Israeli citizens are NOT well armed. Think NJ style regs, only more draconian. There would be no way to tell 1,000 folks in America to "get your jihad on, Nov 16th!" and not have the feds find out. Not possible. Every additional person you tell doubles the risk of exposure. That ONE of those 1,000 folks wouldn't be a fed informant, or have a family member call the feds? Dude, the Underwear bomber was a cell of One Guy, and his dad still called us. A very large number of "terrorist" (more like loonies with delusions of grandeur) are busted by random Muslims picking up the phone and saying "Omar is off his meds and planning something stupid." The majority of the rest of "terrorist" cells are typically FBI sting (or entrapment) operations. You have a very limited number of actually planned, professional terrorist operations.
There is certainly no way to get 1,000 of them into the US. And again, most average Joe American Muslim are not likely to go blow something up because they got an email from the interwebz.
This is an oddly badly written article. I read his On Killing. It was interesting, and had some informative sections. Overall, not a great book but worth the $20 I spent on it. If he wrote this article, I suspect someone helped him write On Killing. Or he's trying to make roll some fearmongering for some odd reason. He didn't strike me as one of the insane "We must killz all the evil Muslims! Arbeit macht frei!"