Why They Say "Ignorance Of the Law is No Excuse"

Here are ten reasons why when a judge says, "ignorance of the law is no excuse", while police officers may respond dismissively when some one attempts to cite a law:
1. Enforcement of state authority:
2. Discouraging dissent:
3. Encouraging submission:
4.Intimidation:
5. Undermining the people's empowerment:
6.Protection of state power:
7. Silencing opposition:
8.Discouraging legal knowledge:
9. Eroding the rule of law:
10.Control through confusion: