If it is a mental health problem, why do you want the mentally ill to buy guns? We restrict liquor and drugs not because they are bad, but because of what people do with them can be bad. We heavily restrict automobiles, they must be licensed, registered and inspected annually. We heavily restrict drivers of all motor vehicles they must be licensed, obey traffic laws and are subject to retesting and revocation for cause. Why should the number one cause of childhood death not have similar restrictions? What is wrong with requiring gun owners to be licensed, tested and insured?

The UK has a knife crime problem. It is not as big as the American gun violence problem but then again, it is nigh impossible to be killed as an innocent bystander in a drive-by knifing.

NB. And yes we do have our equivalents to Chicago.