I believe I made this point several times already on this thread, but this just shows one more time what a deep psychological and cultural abyss exists between ME and West. In Arab Bedouin culture children are nothing, women are a birthing resource, fighting age men are the only "people" and everybody is disposable.
To put it simply, they can't possibly understands the depth of their own depravity and savagery in our eyes, so they are not really trying to tone it down, quite the contrary. On some pure intellectual level they are aware this is not good for PR, hence the lies about IDF killing the Bibas's. But other than that they simply don't care and don't really understand why should anyone. Sacrificing children - their own - is a routine, why would they care about couple of Jew ones..?
The grotesque theater around the body exchange makes a complete sense to them - as an intimidation and defiance display. And on a fundamental psychological level they are completely oblivious to the real effect it makes in the West. They see our grief and mistake it for weakness, so they keep pushing, whilst in reality it just created of millions of new Kahanes around the world and a very clear and uncompromising understanding that this evil simply cannot be permitted to exist anymore.