Last week, Barack Obama became the first sitting U.S. president to visit the city of Hiroshima, Japan—the site where Americans dropped an atomic bomb in August 1945, killing anywhere from 90,000 to 146,000 people instantly and thousands more in the coming months and years.

Obama spoke passionately against the use of atomic weapons in the future. But Charles Sennott, executive director of The GroundTruth Project, said the president's policies don't necessarily send the same message.

"Obama has had the courage in his presidency to go right into some of the most complex emotional landscapes we have...and deal with it," Sennott said. "That was risky business, to go."

But at the same time, a recently published Pentagon report shows that his administration has reduced the U.S. stockpile less than any other post-Cold War presidency. 

"As powerful an orator as President Obama is, there's always some place where you can ask: how much has he really done?" Sennott asked.

To hear more from Charles Sennott, tune in to Boston Public Radio above.