People don't choose to be born, they do choose to become cops.
And, equally, you can't get fired from a racial/ethnic group, Scottish people don't have to attend annual reviews where they demonstrate how they've met their haggis-eating KPIs or whatever, but people do have to perform certain behaviours to stay in their jobs or else they get fired. That's why it's not an inaccurate generalisation to say All Receptionists Answer the Phone and Greet Visitors, or All Academics Write Stuff, or All Taxi Drivers Drive Taxis or whatever.
I grew up in a working class area and anti-police sentiment was completely normal. People didn't necessarily plan to get rid of them and probably didn't even think that it was possible. A bit like taxes or something.
People don't choose to be born, they do choose to become cops.