...By August 2011, with nearly ten years of terrorism prosecutions since 9/11, we had a database of 508 defendants whom the U.S. government considered terrorists. The way the data broke down was illuminating. Of the 508 defendants, 243 had been targeted by an FBI informant, 158 had been caught in an FBI terrorism sting, and 49 had encountered an agent provocateur. Most of the people who didn't face off against an informant weren't directly involved with terrorism at all, but were instead Category II offenders, small-time criminals with distant links to terrorists overseas. Seventy two of these Category II offenders had been charged with making false statements, while 121 had been prosecuted for immigration violations. Of the 508 cases, I could count on one hand the number of actual terrorists, such as failed New York City subway bomber Najibullah Zazi, who posed a direct threat to the United States.
...For more than a decade, the FBI has thrown as much as it can toward an effort to stop the "next" terrorist attack. Every year, the U.S. government allocates $3 billion to the FBI to prevent the next 9/11, more money than the Bureau receives to combat organized crime. But what an analysis of ten years' worth of Justice Department data shows is that Islamic terrorism in the United States is not an immediate and dangerous threat. The FBI's thousands of informants and billions of dollars have not resulted in the capture of dozens of killers ready and able to bomb a crowded building or gun down people in a suburban shopping mall. Instead, the FBI's trawling in Muslim communities has resulted largely in sting operations that target easily susceptible men on the margins of society, men like Michael Curtis Reynolds.
[source : The Terror Factory : Inside the FBI's Manufactured War on Terror]
This was written in 2013, and since then there have been a few incidents each year, in particular attacks in San Bernardino and at the Pulse Club, both of which suggest foreknowledge and/or false flag.
The Ku Klux Klan killed hundreds if not thousands.
But Trump wants to focus on Islamic terrorism and ignore every other form of terrorism.