Indeed you shouldn't make excuses. "{Sketchy component} is just one part of the process and is harmless in principle because we have other safeguards such as... nothing we care to subject to your scrutiny" is the prototypical excuse of a broken system:
> The office stated, “Facial recognition technology is used as one tool among many available to investigators. In this case, it was one tool, but certainly not the only tool, which lent to the probable cause determination that Mr. Richardson was the perpetrator of these crimes.”
The other tool appears to have been good ol' fashioned racism:
> Richardson alleged racial profiling played a role in his misidentification. “I want to say racial profiling. The guy said it was a guy with dreads and a big nose, and then they picked me out of a lineup of guys that look nothing like me,” Richardson said.