Bear imagery significance.
I think Kubrick might have been thinking along the lines of this being a twisted version of the Three Bears nursery rhyme. The whole family speak to each other in a phoney way reminiscent of a children’s book, but underneath there are hints of savagery, especially from Papa-bear, and Mama-bear’s in denial.
I suspect Kubrick is contrasting picket-fence American culture with its savage foundations, our ‘cozy’ modern existence contrasts with our beastly origins. Blowbear is the most stark representation of humanity as base creatures, the depraved sexual act perversely mirroring the innocence of Danny lying on his bed with his bear-pillow.
It’s also possible that the Red Indians who were violently repelled during the building of the Overlook, themselves had to repel bears, who no doubt are responsible for some of the dead in their ‘burial ground’.
I think people ‘overlook’ the man vs nature aspect of the story. It’s set in the wilderness, far from civilisation, and the setting seems to overwhelm what there is of Jack’s civilised veneer, calling forth his inner beast, as it has many before him.