How to stop those who kill many

Too many times recently have there been stories about people trying and occasionally succeeding in killing multiple people. I have realized that every person who attempts to kill others has three common facets.

1) The desire to kill. Whether the victims are random or specific, all who choose to kill want to do so. Every person who attempts to kill either one person or a group of people makes a conscious decision to do so and once that choice is made and actions are taken, there is no turning back. Many who do that have an escape plan or an alibi but that does not always work.

Preventing the desire would require a world where there is no desire to kill as well as recognition, treatment, and possibly preventative actions towards those whom seem likely to do so. That would require a complete change in society to fully work.

2) The opportunity to kill. A highly trained soldier has fallen to a person who had the benefit of surprise. There are many places where people gather in life where a person with the correct equipment could easily kill many.

Preventing the opportunity would require that all public places where many could gather be closely monitored at all times to prevent one person or a small group of attackers from being successful. Doing that fully would turn the country into a police state.

3) The equipment to kill. Many can kill one or two people quickly under the correct circumstances with only their bare hands or a simple hand weapon but killing many requires something more. Though bombs and vehicles have been used, guns have been the most popular choice in the US due to technology and availability since other methods that succeeded became regulated and more difficult to use shortly afterward.

Limiting access to guns with the capability of killing many in a short time has been done in many countries with positive results and seems to be the most easily attainable of the three solutions.