Did they round up all white men. That's a bit of news I missed.
You missed it because they scrutinized the white men that fit the profile: Young, white men staying in motels in Junction City, Kansas near the time of the Oklahoma City bombing.
You are simply setting up and knocking down your own Strawman Argument. There are 6 million Muslims in the USA. The FBI is questioning an extremely small percentage of them that fit the profile of a possible terrorist.
If you compare percentages, the percentage of Muslim men being profiled for this questioning would be much smaller than the percentage of young white men that stayed in motels in Junction City, Kansas near the time of the Oklahoma City bombing.