Most departments are understaffed. Turns out all the negative press against police is having long term impacts on how many kids want to grow up and become a police officer.
Also property crimes always take a backseat to more violent crimes.
In many cases the police and sheriffs themselves are not hiring because they are faced with choice of keeping high pension payouts or hiring more people
Also, the background check process is intense, (and deals with the exact same understaffing problems) and it turns out that most people aren't willing to wait for nine months to get vetted for an entry-level job.
Also property crimes always take a backseat to more violent crimes.