Also in that article you'd find statements from the director of the retail crime division at CVS Health, the head of the investigations bureau at the San Francisco Police Department, a member of the board of supervisors, and the author himself.

Then you could read the dozens of major news sources that ran this story, a similar story right here about Target, the numerous anecdotes about crime in SF, and the DA's publicly announced policy.

It's quite well established that crime in SF is costing Walgreen's and other retailers a lot of money. Is that the only reason those stores closed? Perhaps not, but I see no cause to doubt that it was a factor.