You're the scientist, so you cant kill Sarif and put humankind back into dark ages for fear of technology. (Yes you can, its just a game
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Did you manage to win the argument with the Humanity Front leader at press conference? I couldn't
However, I found out that I've missed "Acquaintances Forgotten" side mission, so I have restarted the game from scratch (plot branches in the first mission so that wrong choice makes it inaccessible much later on), so I'll have another go at this press conference too