I don’t blame the Kurds. Those homes are likely to be unlivable anyway midst all that warfare. Destroying the nonhabitable symbol of property takes these items off the table of conquest, and puts ISIS into a further state of disarray. We in the states could not dare to (openly) do this without the U.N. phonies starting to huff and puff.
If these are places where ISIS fighters found refuge, it makes sense to leave them no where to hide and then start over. Let them leave for Turkey or the EU or be killed.