...because he is a thief. A laptop thief. (Well, four laptops and 2 Macs, to be precise.)
Also - he is a Flickr account hijacker.
He 'hijacked' the Flickr account of the man from whom he stole the computers, and...
POSTED PICTURES OF HIMSELF IN IT!
You can click on his pretty little picture to go read all about it!
I bet he needed some adult diapers when he figured out what he'd done! He has to know, it's all over the internet!