How could the ALP let this happen?

Extract from the book "Hansonism, trick or treat" by Don Veitch:

"People at the Base (the voter) never achieve or have impact on the power structure or on the direction of the Executive (senior bureaucrats and those who formulate policy) policy, unless they are aligned with a Central Oligarchic Groupings -COG - (such as oil cartels, wealthy families etc...) and have higher support in the Executive arms. The media selects what causes to promote, the COGs choose their allies, and the Executive arms facilitate or disrupt those networks it chooses. The Base, which votes for the Parliaments (state and federal) has no power, little influence and is essentially an impotent shadow boxing forum. Voting is a circuit breaker directing potential insurrection into the manageable forum of Parliament."

How has this happened?