I can't for the life of me understand why the BMOL vs. US hunters, Mary's resurrection trauma and the morality of killing monsters wasn't enough for this season.

Lucifer should have been killed last season. It would have been a great and dignified ending for his character; he makes up with his dad and then grudgingly joins up with the good guys and has a redemptive death.

Instead, they continued to completely butcher and ruin his character and create this offensive and stupid plotline. WHYYYY.