In this case, the monkey "borrowed" somebody else's camera, without permission, and took the picture in question. If I steal somebody's camera, and take photos with it, do I still own the copyright?
If I break into your apartment and write a poem using your pen, do I own the copyright?
Bananas.
If i break into someone's apartment and write a poem with their pen and paper, obviously i still own the copyright.
However, if i write code for an employer the contract almost certainly states that the employer owns my work (and in some (all?) states it's a Work for Hire). jrockway was purposefully making an argument that does not apply in the situation or make sense, and he is being downvoted for it.
I do not appriciate ad hominem attack against those that downvoted a trollish comment.