By the way, a little extra on the 1v2 engine argument...
If you look at the T/W ratio of jet engines over the years, you will get the impression that there is a square-cube law at work in that the biggest military jet engines have lower T/Ws than smaller ones. I think the best of the F110/F100 group manage about 8, but the F414/EJ200 are at 9-9.2 and neither has been through an uprate.
I have also seen it argued (I think in discussion of early 1v2 arguments on Typhoon) that two engines are shorter and may pack in there better.
As for safety, it seems logical that singles are subject to an aircraft-loss mode (loss of power internal to one engine) that does not affect twins... and I have yet to see anyone advocate single-engine airliners.