Just like Google, Microsoft, Apple, etc, etc. Nobody wants to fess up, but some appear to be "trying" to step up to the NSA now.
I wonder if they (private companies) secretly allowed it(NSA infiltration) to happen under fear of the NSA using whatever power they have to get the companies shut down if they didn't follow suit. Now that the public has been informed, the companies are using all the plausible deniability they can to prevent lawsuits. In the case of the UPS, I don't think there's any plausible deniability to use...It's not a software system that the NSA could exploit per-se.
Or is it the case these companies really are just as corrupt as the NSA?
I really don't see any other alternative, unless you want to argue that Snowdens docs were fake (Highly unlikely).