You can't or shouldn't legislate for aberrant behaviour, just as you cannot eliminate risk, you can manage it however.
Having said that, someone with influence needs to grow a pair and make some decisions based on what the majority want.
Momoe, this has been done to death in other topics.
The restrictions are about more than keeping the fans away.
People with no interest in aviation can be killed on the main road, like at Shoreham. So, just because a majority of visitors to the area want to see high energy displays, the RAF can't be seen to be risking the lives of the locals who are not so keen.