Two weeks ago, ISIS released a video of a Jordanian pilot being burnt alive in a cage. Later on that week there was a video of a series of cages holding Kurdish Peshmerga soldiers captured by ISIS.
Recently, images have been released of children in cages similar to the ones both the pilot and the soldiers were in. This was a form of protest by the activists in Syria. All the children within the cages are Syrian and what these anti-government activists are trying to say is that Syrian President Bashar al-Assad has caused just as much harm as ISIS. They are comparing the Syrian regime to ISIS.