I think you're mixing politics with ethics.
Does anything you brought up matter to the overall point that government is in the habit of breaking it's own laws?
Fast and Furious lost "strength" as a scandal because gun walking was revealed to be a "standard" technique implemented at a local level. There's questionable legal and moral basis for this, regardless of whose fault it is politically. There's a big difference between something seen as a "fake scandal" and something which "didn't happen." Gun walking does happen and it shouldn't.
It was still wrong for the IRS to delay applications the way they did; the IRS still insisted on information they weren't entitled to. The IRS did share information with people outside government that they shouldn't have. It's not ok that these things happened just because it hurt people evenly across the political spectrum.
It's not ok for any president to ignore implementing a law. Does the fact that Bush's administration ignored environmental law make it ok that Obama's administration ignores the health care law? This doesn't make any sense. Can the next administration pick a new set of laws to ignore? It's silly. We don't want a system where that kind of behavior is ok.
Your arguments are part of the problem here. (PART, not the whole problem, calm down...) We have to stop looking at things in terms of who is winning and losing politically. The root problem in our country is a pattern of poor governance. Regardless of who is in power, we need to expect and receive competent and ethical government. We are not getting that. (And the point of this discussion is that Christie is part of the problem, not the solution.)
There were many moderate Republicans and Independent voters who recognized after Bush that the Republican party had "lost" the ability to effectively govern (I was one of them). There will be many moderate Democrats and Independents who now come to the same conclusion about the Democratic party. As you point out, government is more than just the person at the top, it's the infrastructure, culture and people installed in the hundreds of administrative positions under the president. Now though, we have few (no?) credible alternatives to turn to...