The ISIS extremists are horrible, repressive, violent and hateful people, representing all that is evil and vile when religion is hijacked by the misguided and those who seek to legitimize what is not legitimate, valid or justified. And
THAT is not unique to the vicious sectarian oppression of Islam.
So, while deploring the violence and the horrors of ISIS, it seems worth noting that history repeats itself. And it does so most horrifically when we do not learn the lessons of history, not just names occurring in history, long past and/or recent.