It's a natural mineral with many health benefits. Look it up by it's chemical name, not it's brand name. It is not dangerous. Period. Just like anything else if you eat too much you will get sick.

I doubt anyone really is except in a few isolated cases, but the media has to make a big deal out of it.

I use the stuff as a laundry additive since I have hard water. Makes detergents go a lot farther.

The same reason why you wouldn't eat a copper pipe. The human body can beneficially use them in trace amounts, but like anything else, you can run into problems if you get too much inside you.