Permanent Marker Ban!!!

Really....why do we need permanent markers? I don't own many but with in a 2 minute period (no lie) my son that shall remain nameless found a black one and made pretty little swirls all over the bottom half of the glass on my french doors in the office! Yes..he is alive and well but I about lost all my hair! So again I ask....Why do we have permanent makers?! Obviously they went right into the trash can! I was so flustered that I could not even take a picture....naughty boy!