Thor: Your work with the Tesseract is what drew Loki to it... and his allies. It is a signal to the Realm that Earth is ready for a higher form of war!
Nick Fury: Higher form? You forced our hand! We had to come up with some way that we could...
Tony Stark: A nuclear deterrent? Cause that always works well...
Nick Fury: Remind me how you made your fortune, Mr Stark.