Too much action for bottom two? Justified play because of blockers.

No player in this hand is overly aggressive or has any history of bluffing or semi bluffing, all on the tighter side. Chat after the hand 67 stated he played it that way because he blocked set of sixes and set of sevens. 77 said he would of played the same way because he easily could of had AK there. I believe this is an example of people misusing blockers.