Hodgins could have made more sense (although, if they did that...that would have been grounds for me to stop watching the show as well since both he and Zack were my favorite characters on the show...)
Sweets would have made more sense too, since they were hinting at that in the original Gorgomon episode...and the profile of the killer at the end of that episode looked like him.
I will admit, reluctantly, that post-war Zack kind of makes sense...since he's seemed a little different since coming back.
But, they really should have developed the story better. I dunno, save it for the next season if they needed to.
If they were going to get rid of a clearly beloved character like that...then by god, they should have had the respect to do a better job developing it and explaining his reasons for finding the logic in a cannibal...
I am serious, this was the line they crossed that made me decide to stop watching the show.
The only way I'll watch it again now, is if they have Zack guest star.
Other than that, why should I watch again? They destroyed one of my favorite characters! I'm afraid they'll try the same BS with Hodgins!