Probably because on Monday the Pentagon announced that an American airstrike in Yemen several days ago, which targeted Al Qaeda’s Yemen branch, killed a former Guantánamo Bay detainee. The ex-detainee, known as Mohammed Tahar at the time he was imprisoned in Cuba, had been repatriated to Yemen in December 2009, under the Obama administration.

Why did most of the so-called recidivists come from Bush-era releases?

One reason is that most of the former Guantánamo detainees in the world departed the prison under Mr. Bush: 532 of the 714 former detainees who left the prison alive departed under Mr. Bush. That is because Mr. Bush decided in his second term that, as he wrote in his memoir, “the detention facility had become a propaganda tool for our enemies and a distraction for our allies,” and he started trying to close it.

But it is also true that in terms of percentages, Bush-era releases have been more likely to cause problems than Obama-era releases: About 35 percent of Bush-era transfers are confirmed or suspected of causing problems, while about 11.5 percent of Obama-era transfers fall into one of those two categories, according to the intelligence director’s office.

The difference is because the Bush administration struck diplomatic deals to repatriate large batches of prisoners to countries like Saudi Arabia and Afghanistan in bulk, and many recidivists come from those batches. By contrast, the Obama administration developed an individualized review process by six agencies to determine whether to recommend transferring each detainee. Over time, it also developed more careful diplomatic and monitoring plans with receiving countries to ease their reintegration into society that reduced, but obviously did not eliminate, the risk of recidivism.

Who is left at Guantánamo?

Mr. Obama made a late push to get the number of men on a list of those recommended for transfer — many of whom were low-level Yemeni prisoners who languished with that status for years because Yemen was in chaos and there was no good place to send them — resettled in stable countries. By the time of Mr. Trump’s inauguration, there were just 41 prisoners left. Of those, 10 are facing charges or were convicted in the military commissions system; 26 are being held in open-ended wartime detention; and five are on the list of those recommended for transfer.