Well no surprise there, Harry was essentially a jock who only excelled in two things:
- magical self defence
- sports
And he was good enough in magical self defence that he took down the biggest baddest wizard with just the disarming spell. Literally a magical "put yer gun down".
He could've gone into sports but hey, he just finished off the "big bad" shortly after he turned 18, so of course he'd chase that high. Especially when his girlfriend went into sports and they could hardly both play, that would be constant tension.
So yup, he went on to be a cop. And I see a lot of people claiming that ooh, the wizarding world is different, the police aren't sent after innocent people, their justice system isn't rigged, there's no discrimination, yada yada... Hello??? Magical SAPIENT creatures are routinely enslaved, Dumbledore, someone people thought to be above reproach, was constantly accosted by the very same cops, Harry himself was accused and dragged into a kangaroo court over DEFENDING himself, the aurors have proven time after time that most of them are just as ineffective as the typical Murican doughnut-muncher mall cop, and about discrimination... "mudbloods" need a reminder? Or how Filch is treated?
The wizarding world is the last living remnant of the elitism of the British monarchy/nobility, and if you don't see this, you lack practically all comprehensive reading skills. Put down those rose tinted glasses and read Harry Potter while paying attention to the social narrarive. It will open your eyes.