Probably the only type of destruction of art as protest I condone. The piece:
Is not very old or culturally/historically important
Directly depicts someone at the root of this conflict
Was deliberately targeted and the reasons layed out
Trying to destroy unrelated art work is just wasteful of our shared human heritage. Attacking symbols of oppression however is perfectly valid in my opinion and is to me perfectly reasonable escalation when peaceful protests obviously do not bring the changes needed.
I put this on the same level as African Americans attacking statues of confederate generals and other proponents of slavery to hammer home their point.