I am sure that the bill *does not* require that private organizations allow the carry of firearms on their property. The argument is a strawman put forward by those who want to ban all carry. They claim that they should not have to ban carry on their own... that the government should ban it for everyone so that they do not have to do it.
It is a very stupid argument, but it is made all the time by the anti-freedom types.
Wonderful! You got my point.