How did he arrive at this?

Galrahn over at Information Dissemination has some 'interesting' thoughts on the second engine fire/explosion to occur to US Navy/Marine F/A-18C's within a month.  Read his whole article at his place but these are the statements that caught my attention.

My second thought is how the Joint Strike Fighter would have been FUBAR once the engine goes out. It is hard to believe the US Navy is still going down the one engine path.

My final thought is what a good job the pilot did getting the Hornet back on deck. There really is lots of good stuff here. Well done to the Navy for releasing the video, even in what is ultimately bad news (an engine blows up on a flight deck) there is a lot of great stuff in this simple video.

Wow.

An old airplane has suffered two engine mishaps in less than a month and we get into a debate on which is better...single or twin engines?

Galrahn knows better and has access to NAVAIR studies on the issue.  As Derek stated on his blog...

Two engines are not any better than one. It is a myth that all twin jets can survive on one engine. Not all systems are redundantly powered by both engines. Also if the failure is catastrophic it could kill the other engine too.

If you understand probability if you have two engines with the same rate of failure then you are doubling the chance of an engine failure over a single engined aircraft.

The F-8, A-4, and A-7 had similar safety records as all the other twin engine aircraft of their generation......

As far as the part about the pilot doing a good job...I agree.

As far as there being alot of good stuff on the video...totally disagree.  He lauds the crash crew for getting quickly to the crash but to be honest (unless he's never been up close to flight ops)...crash crews are on alert for all landings at military sites.  Additionally even if they weren't they'd be alerted after a pilot aborted his landing (especially during night ops)...but lastly...the main focus should be on a second engine going tits up.  I'm really surprised we aren't seeing a safety stand down so that these engines can be inspected.  Could ops tempo be interfering with fleet safety?