THF gear has often always had a LOT of +Enmity. Im assuming because it got TA and it was supposed to have this niche of enmity setting and bouncing. I mean, your body piece has +30 enmity.
Dancer also gets +Enmity because it had a "Suddenly i can tank kinda" niche.
The dagger having +Enmity isnt really odd or surprising given both classes have always gotten a decent amount of random enmity gear/JAs.