Thats because bricks are not even. You are completely missing the point. If you aren't going to bother reading the topic then get out.
Using half bricks will get one to a closer circle. I've made many perfect circles, vertical and horizontal. Working with half bricks always made it easier.
And no need to be so miffed. If you can not tolerate others' advocations, then YOU should get out.
And what authority would you have to undermine my argumentative platform?