If Bush had forgotten that, the protestors would simply be arrested and carted away. Protestors of any kind don't typically just sit by quietly and allow someone to speak. They are going to get in their face and cause a scene. So, it makes perfect sence to keep them back from the intended purpose of a Presidential visit.

The protestors are allowed to protest and to assemble. I don't see anything wrong with keeping them away from the President. If the media wants to seek out the protestors to get their views, they're free to do so.

There's no real story here.