Ratpoison, would you rather they just left him on the galley floor, to be stepped over for the remainder of the flight? Placing the deceased in a J class seat is a far more dignified response, sure there's cleanup to be done later but in this case I think a ruined seat is a better alternative than treating him like so much cargo....
The article does not specify but it is very possible that there were other complications/issues going on here. Don't be so quick to judge the crew! Just as people here always say don't hang the pilot til you knowt he full story...