I don't know that it's "blame" necessarily. Still, apart from definite abuse (which happens), if in one's formative years there were experiences, or key things missing, or withheld, for whatever reason, which caused one to develop in varous areas inadequately, or in a misshapen way, or even not at all, these things need to be identified in later life and worked on.

Parents have a LOT of power, and it's not always used wisely or well. Parents have a heavy obligation, and it's not always lived up to.
I am in such admiration of those on PC who have mentioned problems in their families of origin, who have children today and are determined not to repeat the past but to do better for their own kids.