Why Is the Killer of British MP Jo Cox Not Called a "Terrorist"?

Prime Minister David Cameron, Labour Leader Jeremy Corbyn lay flowersTributes left at the scene where Jo Cox MP was killed, Birstall, Yorkshire, UK - 17 Jun 2016 (Rex Features via AP Images)

Why Is the Killer of British MP Jo Cox Not Being Called a “Terrorist”?

The term now has little meaning other than “a Muslim who engages in violence against Westerners or their allies.”