The way insurance works is that risky behavior leads to higher premiums. Insuring a sports car is more expensive because studies show risky driving is associated with sports cars.
Hosts that don't treat neighbors respectfully or guests safely will quickly see bonds confiscated and premiums raised until they are out of the business.
Likewise, insurers often provide discounts for good behavior like taking safety courses, a history without incidents, installing anti theft devices, etc.
And requiring insurance also gives neighbors a recourse (payouts from the policy) if the block is set on for or something (though there are already laws and regulations about that sort of thing).