I actually agree, it's a problem. As other people also argued here, the existing law is perhaps too fuzzy even though I personally agree with the sentiment (and do believe it is applicable as-is in the recent Quran cases).

Laws can sometimes be intentionally written broadly as to cover future unanticipated cases, but for the recent events it's not clear what is covered and what isn't covered. That has to be tried in court to set a precedent then, and that hasn't been done. And part of why it hasn't been done seems to be that the prosecutors are unsure of how their case will go in court, so they choose not to prosecute... At least that's how I have understood it.