You can’t act like media doesn’t help inform your biases. Sure, your opinion on nonexistent crime fighting turtles may not have changed, since that is complete fantasy. But your view on crime itself?
I saw Batman as a kid, and, though Batman obviously isn’t real, crime certainly is, and so are urban decay and bad neighbourhoods in cities. Seeing Batman take out goons and thugs made be believe those goons and thugs existed, and that I’d be in danger if I went out at night. More scared, in fact, because I knew Batman wouldn’t save me, since he isn’t real. The Batman films made Batman feel necessary, and his absence made the world scarier.