I don't disagree, but which? All of them?
Therefore all mosques in America should be given a look-see to determine if they liable to be harboring terrorists.
The same goes for Muslim gatherings such as conventions.
The investigation of Muslim groups doesn't have to be high-profile or intrusive to be effective.
But the Muslim radicals are in the ascendency world-wide so we have to keep abreast of what's going on in the American ummah.