One person's "blaming the parents" can be another person's "healthy action to try to put the past behind me".
For example, in my case, I am not in contact with my parents or older siblings. I stay away because contact with them has always been one sided (me chasing after them, listening to them, supporting them) and I get angry and hurt and exasperated by them whenever I have any dealings with them. This I coped with adequately until I had children. I then realised that the effect they had on me was impacting on my dealing with my children. All the rage and anger I used to channel into work or exercise or boozing I was channelling into my own mothering. So for my own sake and the sake of my DH and DC, I cut contact. I am moving on and trying to make a healthier life for my little family. Until such time as seeing my parents and siblings does not effect me so violently, I think it's best to stay away. That's my side of the fence.
On the other side of the fence sit my parents and siblings. From their point of view, I am punishing them for things I should have gotten over. I am, in fact, not getting over my childhood, because, for them, I am cutting them out simply to hurt them. If I try to talk about why I feel so angry, they just retaliate with all the excuses others have discussed above. Their own shitty childhoods, the financial pressures (brought upon themselves), yadda yadda yadda. Things I had absolutely no control over as a child, and have no control over now, but for which they are, in effect, expecting me to take the blame, by absolving them of any.
What I don't want to do is take out my myriad of issues, which all stem from childhood, on innocents, in particular, DH and my DC. For me, "getting over it" is breaking the cycle and not treating them as I was treated. Personally, though, I will never just "get over it", their treatment made me who I am and, for me, the past can't be undone, just understood, processed and (hopefully one day) forgotten.