Because he thinks it’s a good joke…
Do not go to www.tshirthell.com unless you’ve already read the book. 
I really, really want the Snape is Innocent shirt, but I feel I should wait a bit before wearing it.
I was going to post a thread about that and thought I’d jump in here to see if anyone beat me…Ya did!
I got caught! I haven’t read the book yet and went to tshirthell.com to find a tshirt for a bachelor party…I just fell over laughing! It’s great, I love it, it is spoiled for me now, but the shirt makes up for it.
-Tcat
I so want that t-shirt.
Except, I am out of my black phase.
Can I get it in pink cause I’m trying to be a fookin’ girly girl.
The shirt overplays it’s joke. For example, saying “there I saved you 4 hours and $30.” People read the book for pleasure, not to learn Dumbledore dies. And they don’t pay $30 unless maybe they’re Canadian.
Less is more. “Snape kills Dumbledore” would be funnier.
Writes on board 1000 times: its its its its its its…