Such a shame and really pointless. http://archaeologynewsnetwork.blogspot.com/2015/07/isis-smashes-priceless-palmyra-artefacts.html
It makes sense, it's like the book-burning Nazis. Destroy all other cultures so you don't have any identity but the one they force on you. Not that I am in any way promoting/supporting it, just stating the reason behind the actions.
I can't look at it. It irritates me. It was bad enough when all those Licchavi period temples were destroyed in Kathmandu due to the Earthquake. This is purposefully done one day all we will have is the coins in the hands of collectors and relics in museums. Be glad we collect what we collect, this way the history will never truly be lost.