I'll chime in on this one. Without revealing too much of what my role is, I oversaw inventory operations in the Seattle market along with the inventory management and AP HQ teams.
The Small Formats in question (even the ones not closing) for this market are high theft, low margin. It's not that PD isn't making arrests or prosecuting thieves, rather that the volume has increased so much that it's not viable to stop all of it without significant payroll and asset investment.
The AP teams in this market have some of the highest apprehension rates in the company. Multiple stores in the market are in the top 10.
Moving onto speculation, it's likely because these stores are Small Formats. Full size stores in good locations offer much larger margins to handle things like this. SF stores only break even because of their low payroll investment and very specialized merchandising. It just makes more sense from a corporate perspective to kill off these locations rather than invest payroll into an AP team/store ops TMs that rival a standard store. Stores with similar rates of theft have an ETL-AP, APS, and multiple TSS. Most SFs don't even get ETLs beyond the SD, let alone a full AP team with an exempt leader.