First let me tell here an Ayat from Quran:
If any one slew a person - unless it be for murder or for spreading mischief in the land - it would be as if he slew the whole humanity: and if any one saved a life, it would be as if he saved the whole humanity.
What in the actual fuck is the definition of 'spreading mischief'. People can interpret that in any way they wish. The attacks were Sunni against shia, right? Maybe the sunni's think that shia's are spreading mischief therefore they're fair game to be killed. I know not all muslims feel this way but killing members of your own religion only with slightly different views just shows you how ridiculous this is (though of course all religions are equally ridiculous any way).
Here, spreading mischief means making wars, killing people and spreading hatread and violence etc... It perfectly fits with what ISIS and similar groups are doing. I think they haven't see this!

Where is here? Like 311 said that all depends on a persons interpretation and that's yours. Like most people who follow religion they interpret teachings or rules in their own way or even choose to blindly ignore other parts.
I dont know if they're muslims or not,
but one thing for sure, theyre humans,
and religion is not to be blame for it.
They ain't humans.
Of course they're humans. Backwards with perverted ideology maybe, but they're still humans.