Public schools don't discriminate. Public schools say "yes" to everyone who comes. In fact, they can't say "No."
Public schools have open door policies. Even if they don't have space, they'll make room for you. They'll let you in early and let you stay late while you follow your parents' work schedule. They'll feed you if you didn't have breakfast.
Public schools don't accept "some" or just a "few" - public schools accept ALL.
And that comes at a price.
It's actually reminiscent of the philosophy of the United States - let me quote Lady Liberty as a reminder.
"Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tossed to me.
I lift my lamp beside the golden door."
Democracy is messy - and public schools promote democracy, so they are going to be messy too. But it's worth the fight!