Proof of insanity

From the New York Post:

Now, travelers must show proof of a negative test taken within three days of arriving in the Empire State, and must also quarantine for three more days — and get a new COVID-19 test on the fourth.

And then later in the very same article:

New York’s statewide positivity rate is 1.49 percent.

 

1.49 percent is roughly 300,000 infected people already inside their borders. What exactly are they hoping to accomplish?