Don't interpret the FAR for yourself. Take the time to get to know the regulation; most of it is very plain. Where areas of ambiguity remain (mostly intentional in the writing of the FAR), legal interpretations do in many cases exist.
Who is qualified to give interpretation of the FAR? The FAA Chief Legal Counsel writes interpretations, all of which are archived and available (I have them on CD, along with all other FAA publications). These give a great deal of insight into the rendering of the appropriate portions of the CFR.
"The bottom line is that the only interpretation that matters is the one who is interviewing you or the fed that is violating you. "
This is not correct. An inspector may follow specific guidelines or an understanding in bringing enforcement action. However, in so doing, the inspector is not able to interpret the FAR. He or she may only act within the guidelines as he or she understands them. The interpretation of the FAR will be handled in the appeals process, as provided in administrative law.
The "fed" does not violate you. An inspector may initiate enforcement action, but once initiated, much like a police officer writing a speeding ticket, it's out of his hands. He simply starts the process. The process itself is in your hands. How the individual inspector views the FAR is largely irrelevant, as the only rendering that is of effect is that provided in the appeals process. In every case, the true rendering of the specific law will be shown, and will be applicable.
It behooves every pilot to research and understand the relevant federal aviation regulations. Most of the time when a question comes up, it's proposed by someone who hasn't cracked a book, and then doesn't like the response because it may differ from the traditional public perception.
In my own case, I do NOT offer an interpretation of the FAR. That is outside the scope of my authority and ability, and in no case will I attempt to do so. I may offer an opinion. However, where references are provided, the law is clear on the matter. Most of the time, it's simply a matter of reading and applying that law.
One caution on that subject, and that is that a reading of one passage or subparagraph is usually insufficient to understand the FAR. A common example is the logging of time. 61.51(e)(1)(iii) is often the basis for the dual logging of PIC time during safety pilot training operations. This is legal and acceptable, but needs reference to 91.109(b)(1) for clarification as to the necessity of the second crewmember, to qualify the logging of that time. It also requires reference to 61.51(e)(1)(i). Many segments of the FAR require cross referencing for a full or better understanding of both the legality, and allowances of the law.