Why does this happen?
- Often the sheer number of laws/rules/regulations make enforcement of them an overwhelming impossibility. Cases in point: the U.S. tax code, environmental protection regs, student handbooks in schools, etc.
- Sometimes the enforcer(s) fundamentally disagree the with the laws/rules/regulations. Been there, done that.
- Occasionally the enforcer(s) can be bribed or extorted. Sometimes they get caught, but rarely.
Almost always, those that create the laws/rules/regulations aren't responsible for their enforcement (and don't want to be).
Enforcement is a tricky and unpleasant business, especially when the laws/rules/regulations seem trivial or downright senseless.
As long as we insist on having pages, tomes, volumes, of laws/rules/regulations, we're going to have selective enforcement.