URGENT!! What is the purpose of these statements ? What is the author trying to illustrate ?

It will not do to note that 99 percent of the time the police mediate conflicts without killing people anymore than it will do
for a restaurant to note that 99 percent of the time rats don't run through the dining room. Nor will it do to point out that
most black citizens are killed by other black citizens, not police officers, anymore than it will do to point out that most
American citizens are killed by other American citizens, not terrorists. If officers cannot be expected to act any better
than ordinary citizens, why call them in the first place? Why invest them with any more power?