They don't really read like cops to me. More like the author started writing an otaku schoolgirl yuri but really enjoyed drawing the police hats.
Which, I mean, sure. Hats are important.
Yeah, you're right.
Besides, i don't really think someone's gonna read this and think "Yeah, this will push me to become a police officer!", especially since it's treated with not a lot of seriousness in the manga, for starters...