Why else would we be here?

[keannu]

What is the usage of would in the following? What's the difference with "Why else are we here?"? They are in the same place, so would is a presumption or conditional mood? This is the hardest to understand among the usage of "would".

(Friends)
[FONT=&#44404]- Why are you here?
[/FONT][FONT=&#44404]- Ross and Rachel left a message.
- They're getting married.
[/FONT][FONT=&#44404][/FONT]
[FONT=&#44404]52285 - -Isn't that why you guys are here?
52285 - -Yes. Why else would we be here?
[/FONT][FONT=&#44404][/FONT]
[FONT=&#44404]59592 - What happened?
59592 - Did we miss it?
[/FONT][FONT=&#44404]
[/FONT]

 

[Tdol]

If they weren't there for that reason, they would have to be there for a different reason- the reason makes this an imaginary situation IMO.

 

[keannu]

If they weren't there for that reason, they would have to be there for a different reason- the reason makes this an imaginary situation IMO.

Thank you so much, you are the man!