2 million Muslims live in the United States. Fewer than 100 have been arrested for actions with terrorists/trying to join a jihadi group. While a few US Muslims have been involved in deadly terrorist incidents such as the Ft. Hood mass shooting, the combined number of deaths engendered by US Muslims falls well short of the Nichols/McVey massacre in Oklahoma City -- and they were not affiliated with Islam in any fashion whatsoever.
ALL countries would do well, within limitations imposed by the maintenance of personal liberties, to take measures against domestic terrorism. A Muslim population may be somewhat more prone to radicalization than some other sub-groups (statistically, per capita), but that is by no means the only source of problems.
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