BLU's Suicide Spells

[Ultimatecalibur]

I believe the debuff was added because it made clearing multi act carnival fairly easy with buffing up final sting or self destruct.

I think it was more how BLU parties could quick clear dungeons by abusing Final Sting and Self-Destruct. Much of the 5.1 "balance" changes seemed to be built around prepping the job for group content.