... for that would be bad, you see.

If you outlaw tanks then only outlaws will have tanks.

If you outlaw nukes then only outlaws will have nukes.

If you outlaw force then only outlaws will have force.

If you outlaw the Force then only outlaws will have the Force.

If you outlaw incarceration then only outlaws will have prisons.

If you outlaw chlamydia then only outlaws will have chlamydia.

If you outlaw schizophrenia then only outlaws will have schizophrenia.

If you outlaw in-laws then all outlaws will have in-laws who are outlaws.

If you outlaw Law & Order™ then only outlaws will have law and order.

If you outlaw laws then only outlaws will have laws. (For the anarchist in your life.) 
If you outlaw mortgages with 30-year amortization periods then only outlaws will have mortgages with 30-year amortization periods. (For the Jim Flaherty in your life.)
If you outlaw jaywalking then only outlaws will jaywalk. (For the every-single-person in your life.)

If you outlaw whipped cream then only outlaws will have whipped cream.. (Note: this thought makes me really sad.)

If you outlaw Lego then only outlaws will step on Lego. (Note: this thought makes me really happy.)

If you outlaw good hockey players then the Maple Leafs will not have to make any roster changes to comply with that shift in the criminal code.