Dispensaries, when they got into the business, should have assessed the risks and created a store that can handle extra security. They should plan their building locations based on neighborhood crime risks. They should build a reputation for being secure, like store pharmacies, so that it does not become an easy hit. Being proactive could solve the problem.
Medical marijuana dispensaries are a crime hub. The states making marijuana legal are already realizing what a poor idea it was due to the increase in crime at those locations. You have now concentrated a group of people who can be mugged and robbed and the robbers know that they have money and drugs instead of just money.