Lets be honest, you'd have to be mentally ill to do this. Most of ISIS are mentally ill.
Precisely, some people who get caught up in evenst can get carried on a wave, but when it comes down to the raping of prisoners captured females as entertainment, and blowing oneself up for a cause, it takes indoctination or a weak mind or a broken mind to begin with.
Isis may be either of the above, and it matter not which they are, it is simply bad that they are allowed to operate, install bases, practice their twisted version of faith.
Whether isis linked or not, it takes a crazy person to drive over hundreds of civilians for any reason. Madness, utter hard to stop madness.
We cannot excuse them just because they are mad, a rabid dog still needs pit down, no matter the fact the illness was not of its own making, this is how we must treat isis, with understanding that they are inherent mad, crazy, mentally ill, and cannot be quantified on any normal spectrum, thus they cannot be negotiated with,mor have discussions with.
They, and their caliphate must be obliterated. Utterly.