A former Danish Islamist who seven years ago traveled the Muslim world fueling the uproar over newspaper caricatures of the Prophet Muhammad is back in the headlines in Denmark after doing an about-face on the issue. Once a leading critic of the Danish cartoons, which sparked fiery protests in Muslim countries, Lebanese-born Ahmad Akkari now says the Jyllands-Posten newspaper had the right to print them. His unexpected change of heart has received praise from pundits and politicians in recent weeks, though some question his sincerity. It has also disappointed some in the country’s Muslim minority who were deeply offended by...