This is lazy commentary and we should expect more from someone with her credentials. 

She trots out "right wing terrorists" as a foil for Islamic terrorism but doesn't provide examples of the groups involved, their scope or their sway, so we're left to wonder what constitutes a "right wing terrorist" or to assume that this term pretty much means whatever she wants it to mean in the moment. Given that a huge percentage of terrorists world wide are stark traditionalists, phlegmatic or even dogmatic thinkers, and often egregious nationalists, wouldn't MOST terrorists be "right wing" by the current definitions? I don't see a fundamental difference between fundamentalist Wahhabists or Salafists looking to use terror to bring back the Caliphate vs. fundamentalist Christian militias looking to use terror to make the US a Christian state.

The fact there's home grown terrorists already shouldn't preclude a government from firming up the borders to stop the extremist pool from growing further.