Since 9/11 (Manhattan memorial, above), the U.S. government has quietly released more than 400 people convicted on terrorism-related charges, according to a data analysis of federal prosecutions. Some were deported, but many could be your neighbors. Were they fully rehabilitated? A more likely explanation is that many of them weren't particularly dangerous in the first place.
From The Intercept:
In the war on terror, U.S. District Courts have represented the primary stage of what can fairly be described as national security theater. With a near-perfect record of conviction, the Justice Department since the 9/11 attacks has hauled into court nearly 800 people on terrorism-related charges. While Justice Department and FBI news releases and press conferences heralded the arrests of such defendants, the U.S. government has said precious little about the hundreds of people convicted on terrorism-related charges who have been released back into the United States or deported to their home countries.