And, a good point was made that reasons for war aren't always the ones that are publicly stated.
Give this man a cookie.
To expand on this, the reasons that are stated my be believed by those stating them, but nevertheless be completely false. Look at what happened when Caerwyn declared war on Astrum. Several players have stated that they believed the reasons they gave, yet they were completely fictitious. Which doesn't mean they were lies, they were just poorly informed or misled.
The reasons for a war will rarely, if ever, be declared by both sides as justified. That would require both sides to be viewing the incident from the same point of view, and both being reasonable and logical. And if that was the case, there probably wouldn't have been a war in the first place.