Because they do crap like this and get away with it.
Why do I say 'get away with it'?
Sonny Jackson, a Denver Police spokesman, said Chief Robert White views
each incident case by case "and recommends the discipline he feels is
Which is bullshit. I doubt CO is any different from OK, which would mean accessing state databases for non-LE purposes is a CRIME, not 'slap him on the wrist and say "No, no, bad boy." And, to add to the fun, if they're accessing federal databases, in particular the Interstate Identification Index, that's a federal crime, also with very specific punishments. Which it seems Chief White doesn't care about, or people would be getting fired and prosecuted for this.