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situational obliviousness 

The opposite of situational awareness. Having no clue what's going on around you. Straight-line thinking - aware of your world and its goings ons only.
Sheila almost ran over a biker because of her situational obliviousness.

Mike called the boss a stuck up turd when he was right behind him. That situational obliviousness has him working the weekend.

selective obliviousness 

Having the mental capacity to understand something that's painfully obvious to anybody else and/or has overwhelming and undeniable evidence, but deliberately ignoring it for any number of reasons. Compare willful ignorance.
Jean was presented with mountains of evidence that her husband was cheating on her, and more-or-less covered her ears and went "LALALALALA." I swear, she's engaging in selective obliviousness.