Thanks guys, I've figured it out with your help.
If they admitted it was a nerf, 90% of the forum's raging would come from that.
If instead they pretended it was a bug, only 1% of the raging would come from that, as the original 90% would not be able to relate one thing to the other, and would blindly accept an excuse like that. After all, it is a Test Server, huh? Where they Test things, and find Bugs. Right.
Well played, Blizz.
Edit: inb4 87% of statistics are made up on the spot.
Yup, Blizzard thought it would be brilliant to make a ring that can crit for some 5 million damage. They intentionally made it so it can do that much damage and than realize, nahhh.. let us nerf that.