As far as the Firstnet comments.
Because of what it is, it has to be installed and redundant to a specified standard.
I am not gonna go into all of it, but the list is long and goes WAY beyond what a standard cell site is required to have, and the whole system is for public safety only,
so while it's possible for it to be overloaded, it would only overload if public safety did it as the whole thing is specifically for them.