> You can stop kids from entering public schools without them, sure
Public schools, universities is a good first step.
Well the 0th step if you wish is to not accept their argument during discourse on equal footing. As in "it is a free country and your crazy opinion is just as valid as well established science, now let's discuss".
So treating them like crazies is important, they are to be made fun of and marginalized. Which is kind of like what this blog did.
Most individuals and groups want to be accepted, respected and taken seriously. That is why making fun works, because it attacks that. Nobody want to be a part of a group that is mocked and ridiculed by a majority.
This happened a bit with cults after Jonestown massacre in late 70s. A lot of cult-ish group tried very hard not to be seen as cult-ish. Because it brought bad associations.
You can stop kids from entering public schools without them, sure! But how far do you want to take this?