I agree with Panos that the problem is systemic and needs to be treated on a system-wide level. However, I think that parking violations are not the best analogy and obscure the dynamics a little.

With traffic congestion, the problem is not cars on the road, the problem is too many cars on the road. So if someone is double-parked and is not actually blocking anyone, there really is no fundamental problem.

An academic institution wishes to protect the integrity of its grades and degrees and also wishes to encourage honest behavior in its students. In this case, each individual act of cheating is a problem. The problem is not just too much cheating, but the presence of cheating at all. An academic institution does not plan for a cheating capacity of 20%, for example.

So I would suggest that the analogy works better if parking violations were replaced with bicycle thefts, since every bicycle theft is a problem.