David Ancell,  according to your logic: We should make drugs illegal and then criminals will not have any access to them.  We could only give them access to Tums and Asprin. No one could use the illegal drugs.  Think how many victims of drug related crimes that would save.  Why hasn't someone thought of this?  Let's do it, let's make drugs illegal. That would solve the drug problem. 

Insert Guns for Drugs in the above statement and Swiss Army Knives for the Tums and Asprin.  This is your argument?