[Joe 6-pack]

"You can’t criminalize courageous or lack of courage..."

I would refer you to Article 99 of the UCMJ. Granted it doesn't apply to the Coward of Broward.

[House Atreides]

Yep, cowardice in the face of the enemy is a crime.

https://www.law.cornell.edu/uscode/text/10/899

I would think civilian laws could be enacted to do the same for police. At least cowardice leading to loss of innocent life should result in the coward being fired and losing ALL benefits.