Totally agree with you there NickD. If enough of this goes on it might be a case for contacting the BBC series Watchdog.
Having to pay out thousands of pounds as a result of small impacts with kerbs is NOT acceptable. What would the situation be if the airbags went of with a minor impact, it would not be acceptable. Mazda cannot say this is normal, if it was, nobody would touch an ND with a bargepole and Mazda needs to be made aware of this.