Under this formulation a solution to the problem is to either replace members of the oppressing class with members of the oppressed class, or to take away the power of the oppressors and allocate that power to another group.
Christianity, however, sees not classes but individuals, and evil as pretty evenly distributed amongst individuals in all so called 'classes' of humanity. The Christian predicts that switching the roles of the oppressed and the oppressors is unlikely to result in any noticeable improvement, and as such neither would replacing some members of the oppresssors with the oppressed, nor would taking power away and giving it to another group – as all will, if not immediately, end up as just as corrupt as each other.
It seems that history supports the Christian view – look at the French and Russian revolutions for example.
So if the Christian view is correct, then efforts to reform systems by changing members of the ruling elite from hereditary to elected, or similar, are unlikely to solve all the problems. Of course, systems of accountability do help, and have their place, but this is not the point. The sociologist is not talking so much about systems of accountability, but rather which 'group' holds power. Christianity asserts that corruption and evil in any system will be unchanged regardless of who holds power. In fact, in some cases change may make things worse as protections in place are removed.
So what does this mean? This means that efforts to introduce systems of accountability and many restrictive laws are perhaps worthwhile – although they have a high cost and run the risk of stifling decision making and change. Not to mention that they can eventually be corrupted themselves.
But in regard to really improving society, and doing it in such a way as to allow maximum freedom, the Christian view offers more promise. It suggests that if everyone in a society is actively working towards overcoming their natural selfishness and working to help and love each other, then the situation will improve without the need for tyrannical laws, expensive and time consuming independent panels of review, etc. Thus Christianity offers a way to improve society with the least conflict, and best and freest outcomes. And although it makes no promise of achieving a heaven on earth, we may hope to create a paradise.