"to prevent people from having locksmiths fix or replace their door locks"

In some places (quick check here, California as one example) locksmiths are required to be licensed:

http://www.bsis.ca.gov/forms_pubs/locksmith_fact.shtml

Also noting that there is a physical limitation to the harm that can be done if locksmith tools are sold. Both geographic and how the tool (which in not digital and has friction in distribution) is able to spread.

Someone using locksmith tools will most certainly operate in one area. They can't work from the comfort of their bedroom and in most cases can't cover their tracks as easily as digital crime can be covered (and done from anywhere in the world).