Facial recognition software doesn't have the level of reliability that control software for mechanical systems has. And if a mistake is made, the consequences to the LEO have been historically minimal. Shoot first and ask questions later has been deemed acceptable conduct, so why not implicitly trust in the software? If it's right and you kill a terrorist, you're a hero. If it's wrong and you kill a civilian, the US Supreme Court has stated, "Where the officer has probable cause to believe that the suspect poses a threat of serious physical harm, either to the officer or to others, it is not constitutionally unreasonable to prevent escape by using deadly force." The software provides probable cause, the subject's life is thereby forfeit. From the perspective of the officer, seems a no-brainer.
https://features.propublica.org/navy-accidents/uss-fitzgeral...
https://features.propublica.org/navy-uss-mccain-crash/navy-i...
Software allows us to work very efficiently because it can speed work up. It can speed us up when fucking things up just as well.