I think some may have already mentioned this briefly in one of this 20 something pages of discussion. The scope of the law is way broader than just who can piss where.
The stupidity of the whole matter is that the sole focus got put on which toilet should transgender folks use, which majority of people often fall into this trap of the politicians, media and extremists (far lefts or rights, plus the religious nuts).
They make you concentrate on the stuff that really rallies people up on either extreme ends to accomplish certain agendas.
If you look closer at the law (I'm sure yosemiteben can explain better), it affects almost everyone at certain stage, not just LGBT. The politicians probably didn't care, I'm guessing their main goal was to try to diminish the uprising of the LGBT agenda, I don't believe they even care who can piss where. So they make the law broad enough to make sure to get what they want. And they use the excuse of "think about the children". Like many had mentioned, it has never really been a problem for so long.
Refs:
1.
http://www.charlotteobserver.com/news/politics-government/article68401147.html2.
http://wncn.com/2016/04/01/nc-woman-suing-for-age-discrimination-gets-caught-up-in-hb2-bill-falloutFrom the first url, it asks "Does HB2 affect rights of people who aren’t gay or transgender?" and answers "Yes. The law limits how people pursue claims of discrimination because of race, religion, color, national origin, biological sex or handicap in state courts. The law also means a city or county cannot set a minimum wage standard for private employers."
So it actually affects the religious nuts who adamantly pushing for this, it affects any race (including white) discrimination, it affects age discrimination. It really has a very broad impact. People, as often, don't really know what they are pushing for (both sides). Even NBA, they mostly just focus on LGBT part of the law.
The second url is an example of the broad effect of the law that has NOTHING to do with LGBT matter.
It's what this world has turned into, no one would like to compromise/respect, and just wants it my way only.
Thus, in this instance, Charlotte became the collateral damage, pretty much for nothing.
Wonder if we would ever get to the Star Trek type of world in the future...
Oh well enough said.