> That views laws as self-executing abstractions, which they are not. Laws necessarily are enforced by people.
No it doesn't. The laws are statements of what people in power will do under particular circumstances. This view only makes sense if people are executing the laws. The moment you stop executing the laws, suddenly you don't have laws.
Prosecutorial discretion is another beast entirely. Considering circumstances on a case by case basis is necessary for functional justice, as lawmakers can not possibly foresee all circumstances and even if they could the enforcers of laws have practical limits. A cop letting you off with a warning for speeding is discretion. It is not permission for you or anyone else to ignore the speed limit in the future. The law is still there, and you should expect to suffer the consequences if you break it.
We don't need laws when they ask us to do something we'd want to do anyways. Laws exist for the sole purpose of getting people to do the things they would rather not do, or to prevent them from doing things they would prefer to do. If the law can be violated when it is convenient for the lawmaker, you do not live in a nation of laws.