So the Principal of a school honestly buys into and believes that the Police, a Civil Service department that every municipality has, is a controversial organization, and you say that isn't ideological?I doubt it's ideology based, so much as "Holy shit! Someone's complaining about my school and I better do something" based.
Or the principal glanced at the Wiki article - like me - and decided that if something was "controversial", he better make sure it didn't happen.
And the Gay Pride flag hasn't been "controversial" for over a decade. FFS Hockey Night in Canada makes gay hockey players part of its inclusion commercial break nowadays.
This is basically "Let's find something to whine about. And let's whine twice as hard if we can argue that 'the other guys' got to fly their flag and we didn't!" This is the usual tempest in a teapot dressed up as Culture War because people are self important whiners. Kid can take the flag off the car when he goes to school and fly it on the weekends. Is that such a crushing blow to Western democracy?!
You ever have to do something in high school that probably wasn't strictly equitable, but the principal was a dick and you had to go along with it?..... Did the Western Way of Life survive anyway, even if you couldn't wear those pants or those shoes or whatever. This is the same shit.
Give your head a shake. You were reaching before. I'm surprised you didn't dislocate your arm with this argument.