Abso-damn-lutely.
However, my preferred tactic when dealing with extremism is not to attack the ideology (which is indeed the base reason for it), but the extremists tactics. It is to emotionally separate the the numerous (who may have some sympathy for the base motivations of the extremists) from the extremists themselves by focusing on the tactics (which nobody but the extremists can countenance).
By focusing on the differences from the extremists rather than their similarities, you provide the sympathizers (who nonetheless find the tactics repugnant) with sufficient room to disengage.
Are they going to loudly denounce the extremists? Almost certainly not. But the best possible outcome is that extremist movements die with a whimper, not a bang.
(And this applies to extremists and sympathizers of all stripes.)
