Creepers are only guilty when they explode. And when they explode they die. As you can clearly see, this creeper is alive thus innocent. I am EXTREMELY disappointed in the guy that wrecked the poor creeper's sand castle.
Just for context, I didn't see your profile icon before I changed mine to the one I currently have. Anyone who thought the little guy deserved is a lunatic sadist.
Well, in my defense, these little schmucks gain pleasure from destroying all of OUR HOURS WORTH OF HARD WORK AND DEDICATION! If you had something continuously ruining all of your hard work and dedication, then you would feel the same way too.
They're literally PROGRAMMED to blow you up. If you wanna be mad at someone, be mad at Mojang for adding them. And if that's not enough for you, maybe you should start playing on peaceful mode so there are no creepers in your world.