The fact of the matter is, the company is looking out for themselves, and it is reasonable at first glance to sit back and shut up, to avoid any possible reprisal (though this would have been unlikely do to having that active contact with the authorities). The Security Company will more than likely second that because they only care about their clients' safety, not the public.
The police and/or Federal Investigation unit. . . you gotta understand how this operates. They don't actually care about the short-term dangers so much as the end goal of putting the guy away; that is why protocol is shut up, wait and compile. That way you put this guy/guys/things/group away. Pretty typical in Vice, where you watch the misery and crime unfold, drink yourself into oblivion, and warm-yourself with the hope that at the end some fuckbag goes away.
With that in mind, the dangers are still there. The incentives are to let it ride and kind of interfere without 'tipping off the guy' in order to build a better case. The reality is though, they were still an active threat to people (I do not buy for a minute that part of the statement stating that they weren't. Unless they were behind bars, or publicly outed, they were), and VShoujo had minimal risk of repercussions, but did the smart thing for themselves. . . others be damned (and why not? They are a company whose responsibility is to the talent).
I'm not saying it was the wrong choice logically. It makes total sense, but it is the selfish choice, and one I think would have bitten them hard later on if something had occurred and they were tangentially implicated as withholding information. They can try to hide behind ye-olde, 'but the cops said. . .' 'but the Security Team said. . .' all they want; it won't change a damn thing.