For this ? The guy who was brought back through Ai was killed in a hit and run then they brought the ai version of him to court to give a statement from beyond the grave of sorts. I think it's immoral as fuck but I'm sure I'll get told why it's actually not.
So basically the uac was fucking around with technology and went to far in their pursuit and opened a portal to hell in an attempt to harness it as a power source. Then the game itself kicks off after everything goes wrong and all hell breaks lose.