Only DA for a vast number of people.
Because an automatic response could be under very high stress, and must be automatic--requiring No extra thinking about which extra gun feature must be manipulated.
This is why, simply for gun variety (-wanting a first, modern German police gun-), I added the Walther P99 AS to my Sig P6, P225 ('87) and CZ PCR.
The P99 AS' first shot can be either SA or decocked to DA. Not many striker-fired guns have a decocker. That's why this new gun is Not the PPQ.
I'm new at Krav Maga self-defense (age 64). They add stress to some of the training, because an assault -just a reminder- will usually happen with Very little or no warning.