they are Shia, they dont concern us Muslims.
As-salaamu `alaykum
Not quite. They concern us more than the kuffaar. Shaykh Ul-Islaam Ibn Taymiyyah saw it worse that the Muslims be flooded with ahl ul-bid`ah then them being slaughtered by the kuffaar. Why, because in the first case, it becomes hard to discern islaam from kufr (since they call themselves Muslims in the case of the shi`a, and because some of them are), tawheed from shirk and sunnah from bid`ah, and the harm/corruption spreads. Yet the external enemy who is at war with Muslims, though they kill many Muslims, they don't harm our `aqeedah.
And yes, because the kuffaar still view all the sects of shi`ism as Muslims, we need to dedicate more efforts in clarifying their baatil. And as the sister said, the islamaphobes will be celebrating Christmas, Easter and their birthdays all together out of joy, upon seeing such news!
Was-salaam