Legalise spray, tasers & airguns for self-defence & require businesses hold them

Legalise pepper spray and tasers allowing anyone to carry them. Make all business have them and complete a mandatory course and be inspected once a year like fire extinguishers so we know people are safe everywhere. We think that not only would it guarantee to save lives, it could generate billions for the economy and create lots of jobs. We believe there is literally no downside to this and that even the thought of people carrying items to defend themselves with is enough to put off potential attackers.