Orthodox Posters?

[Maldon]

First of all, thank you all who have written so far. I am lost in this conversation, but I find it fascinating.

My question is this:
Catholics believe that the Orthodox have erred in a number of doctrinal issues, such as divorce, contraception and papal primacy.
Yet it appears they resisted liturgical errors thus far.
Right now, the opinion seems to be that having a decentralized authority led to liturgical purity.
So why did the decentralization not protect the Orthodox from contraception, divorce, etc?

To an Orthodox, this might sound offensive, but I mean no offence. I am trying, instead, to see why there seem always to be 2 imperfect sides to one coin: liturgy and doctrine. Papal primacy and authority seem to have protected us from contraception and divorce. But was it papal primacy or something else? And was it decentralization that led to divorce and contraception in the Orthodox church, or something else?