Explanation of words

Hello,

I need some explanations about this text :

One, among many, devastating strategies of Satan, which is fed by our own shame, is to fight, or rather retreat, in silence. From the very beginning, sin resulted in hiding and shame as Adam and Eve hid from one another by covering themselves (cf. Genesis 3:7) and from the presence of the Lord in the garden by crouching among the trees (cf. Genesis 3:8). A similar type of “hiding” is also evidenced in the refusal to own the sin when confronted. What do Adam and Eve do when confronted? They blame-shift in order to direct the attention of the Lord away from self. They do not want to be “seen” in their sin so they justify it. The belief seems to be that, if the eyes of the Lord shift to the other and away from themselves, they can remain hidden. In either case the sin is avoided, hidden away, and not dealt with in an honest manner. Our natural tendency is to not deal with sin. Out of sight... out of mind... or is it?


"They blame-shift in order to direct the attention of the Lord away from self."
What is the meaning of "blame-shift" in this sentence?

"Our natural tendency is to not deal with sin. Out of sight... out of mind... or is it?"
What represents "or is it?" in this sentence, is it a question tag?

Thank you.