If anything the election of Trump will encourage the rise of left wing terrorism in the US. 

We are seeing the beginnings of it in the violence initiated at Trump rallys and the inauguration by left wing agitators. Or the violence from left wingers at things like last weeks talk by Milo Yiannopoulos where his supporters were physically attacked and one shoot and critically wounded. Or by the attack on camera in Edmonton on a female reporter for Rebel News by a Leftist agitator.