Well the idea is that real estate agents are "not qualified to make statements regarding the safety of an area". They are after all, NOT "experts" in public safety - the police are, right? There are a lot of rules like this. Some of which are to prevent agents from steering clients away due to bias, others to prevent them from steering due to "lack of the expert knowledge that would be required for them to make such a statement". Some of these rules are there to protect them from themselves (getting sued, having grievances filed against them, etc).
The list of stuff like this goes on and on. Consider how many times you'll see an agent say, "consult a lawyer about that", "consult a mortgage broker on that", etc. When it comes right down to it, most agents aren't allowed to say much more than, "Gosh what a lovely home this is", "I could really see your son enjoying running around in that yard", "would you like to buy it", "you should offer full asking price", etc.