You are misrepresenting the odds of a group of people having an outlier hair color vs a group of people having one which matches sufficiently well to a piece of evidence which excludes the others.

'I remember a brown car' vs "I remember a brown 1976 Ford coupe with worn tires and a broken side window'.

please don't forget all the databases that can search for fingerprints, and all the suspects brought before the detectives, and at that point if they did not have a good enough alibi, or good enough psyche to withstand interrogation, or ...

That's a fair comparison, although I don't know if the numbers work out to a 1976 Ford Coupe or more like a 2005 Honda Civic. But the other thing is, fingerprint analysis is also usually expressed as more like "a 70% chance of being a 2005 Honda Civic with worn tires and a broken side window", the match is always partial (another thing that science doesn't support, those %'s given).

But would a jury think someone having a 2005 Honda Civic with worn tires and a broken side window is alone reason to convict someone? Probably not? Would they think "A 75% match with [fingerprint equivalent]" is alone enough reason to convict someone? Usually. Because they are very misinformed about what fingerprint "science" can and does do.