Perhaps the reason has to do with the title. The word heretic conjures up frightful images of controversial characters being barbecued for their beliefs. It smacks of intolerance. The very word dogmatic is perceived as being intolerant. But Chesterton says that man is the animal who makes dogmas.
Trees have no dogmas.
Turnips are singularly broad-minded. There is something ironic about tolerance being an ideal, and that it is connected to religious freedom. In reality, tolerance has done more to suppress religion than has any persecution. It has left us not only afraid to debate about our beliefs, it has made us afraid even to discuss them. As Chesterton says, We now talk about the weather, and call it the complete liberty of all creeds.