There’s a great synopsis of the situation further up the thread, but the short is:
SpaceX originally wasn’t going to launch rockets from this facility… until they announced that they were, then asked for permission from the regulatory bodies after their first launch.
When concerns were raised about the rockets being launched half a kilometer from nature preservation land, and specifically in regard to the possibility of failed launches damaging the launchpad, Elon assured them that no such thing could happen… and then a quarter of the launchpad was destroyed by a failed launch.
So they installed the water deluge system, again asking for permission after they had already installed and used it.
Within their permit application for the system - which, again, was installed and used before the application was even submitted - are mercury measurements 50x higher than the Texas maximum threshold for acute mercury toxicity, and far higher than the thresholds for human safety.
The Elon hate is one thing, and I believe much of the hate for SpaceX is because of how he handles himself and his companies. But the general assurance has largely been that SpaceX has a team of handlers to keep him from screwing things up, and it sounds more like Boeing over there every day.
They may have Elon on a leash, but they seem to be running his playbook anyway.