Because those that govern are irretrievably sinners, government should be as small as possible, and as weak as possible in comparison to the citizen. Those serving in government should do so in as limited a fashion as is possible for the shortest period that makes sense given the learning curve. Most definitely, elected officials should not be able to raise their own salaries, perquisites or pensions while in office.
Combine the truth above with money and power and the result is the ability of the rich and powerful to use the system and to massage circumstances to their own benefit to the detriment of the weaker and poorer. The wealthy always find an excuse, like "the market," to shuffle the benefits of production to themselves, while those who labor to make the production possible get the shaft.
Unions, minimum wage laws, and the SEC have been mere bandaids for the problem. They have the appearance of addressing the issue, but leave the wealthy relatively untouched in their ability to make the system work for themselves, and actually end up working against increased productivity. Why not allow market mechanisms to determine base wages, but have every worker share in the profits produced by corporate ventures (not necessarily just incorporated ones) equally with executives and shareholders?
Human Life Is Precious
Since each human life has its own blood, it should be protected from the womb to the tomb. Abortion is murder, plain and simple. Each abortion kills a human being that left alone would live as long as God determined. Those that perform abortions are guilty of murder, and those that have them done are guilty of conspiring to murder. Assisted suicide could certainly be considered a conspiracy to murder as well.
Family Is More Fundamental than Government
The family, particularly parents, should not be interfered with nor infringed upon. If there is not actual, physically treatable abuse or neglect, no one has any right to tell anyone else how to run their household or raise their children. All decisions, from education to healthcare rests with parents, never with government.
Government Is to Do Good to Its Citizens
Citizens that do ill need to be treated appropriately, but citizens who do not, should never be put into worse situations, or be adversely effected by government action.
One could apply these principles and make a case for everything from publicly assured healthcare to environmental protection, from preventing the seizure of private property to banning professional lobbying. The issue to be balanced in doing so would be whether any stance or proposal would transgress any of these principles in its prescription to cure some ill.