Actually, I'm not happy with either the absurd "violent extremism" approach of pretending religion is not a factor, nor with calling the phenomenon "radical Islam". 'Radical' applied to a religion can indicate taking the religion very seriously, and thus using this name credits the claims of al Qaeda and the Daesh (a.k.a. IS, ISIL, ISIS) to be true expressions of Islam. It is in the interests of pretty much everyone in the world, not just the US, not just our allies, not even just non-Muslim, for people to regard Islam as practiced by the Hashemite Kings of Jordan, the Aga Khan, and General al-Sisi in Egypt as the true expression of Islam.
The problem is the sound approach, speaking of salafist terrorism, salafi radicals, and the like requires actually knowing a little about Islam and adopting the terminology that Muslims use to describe the religious tendency underlying both al Qaeda and the Daesh. Under no interpretation (unless a person is already a self-identified salafi) does it credit the terrorists with being the true expression of Islam as they claim, and it makes clear the underlying religious motivation of the terrorists.