Since 9/11, there were 48 people killed in the US as a result of homegrown right wing terrorist attacks. In the same time frame, there were 45 people killed as a result of homegrown Jihadist attacks. Yet muslims make up around 1% of US population, while right wing recruiting pool (white people? christians? GOP supporters?) is much larger. This is a clear and very significant overrepresentation of US muslims in terrorism.
http://securitydata.newamerica.net/extremists/deadly-attacks.htmlSo certain amount of racial profiling in prevention of terrorism is mathematically justified. Ethically it is arguable, tough. More importantly, the share of muslims in US population doubled over the last decade and is still rising fast. That is what changed recently, and unless this trend is reversed, you can expect more homegrown attacks and more regular terrorist attacks occurring in the future. This is fairly analogous to situation in western Europe, by the way, where a similar transformation is happening but on an even larger scale.
Admitting what the problem is is the necessary first step towards a solution.