It is not a good strategy, but. I have flown hundreds of flight, not one time has the captain announced before landing, We are approaching JFK International airport, please don't panic, not one time.

However panic as a useful behavior when applied in the context if timing. I had a little panic when I learned about the GSM 3 years ago and what has happened in the past cycles. Then I took measures. Secondly, as happened on a daily basis in February and March gov leaders repeatedly stated not to panic.... back to timing, it was time to panic.

Cheers