I believe that was indeed the entire point, Samira, that there really is no way for certain RP corps in conflict with each other to ever reach terms, and barring that, the only way to actually achieve a "permanent victory" is to push so relentlessly hard the other side stops having fun and quits, disbanding their corp or most likely having their members quit the same.
Surrender terms may be "reasonable", but they would also effectively rob the corp of a reason for existing. I have to say though, that doesn't seem to stop anybody. In fact I am not sure I have yet met an RP corp that doesn't have a graveyard's worth of skeletons in it's closet.
There is some fact to back up the argument of wardecs being a good way to ruin or oust players, however:
"CCP Larrikin pulls up activity data for players of corporations that have wars declared against them and it shows considerable activity drops in all activities during the war. They also show that the low activity continues after the war ends. Brisc Rubal noted that the numbers here were so stark, it would justify immediately removing war decs as a mechanic and promising a fix after the fact. The CSM in general were surprised at how stark the numbers were and noted it was clear this mechanic was having a significant impact on player recruitment and retention." -
https://newedenreport.com/2018/10/06/csm13-summer-summit-minutes-and-how-war-decs-are-killing-eve/I feel that this is also true, especially if the parties involved in the war have no desire to actually leave each other be. Now, it seems to me that in some cases, for example, an Amarr vs Minmatar conflict, that the losing party could simply withdraw to their faction's core systems to lick their wounds and rebuild. Yield the field, as it where, cease operations for a while. But if they are incapable of actually surrendering entirely and their enemies are unwilling to go with the idea that they could not or should not pursue their enemies all the way to the core worlds, then they are simply screwed, as one side cannot surrender, the only resolution beyond "backing off and leaving each other be" is to press down until the corp and its players are no more.
This becomes far more likely when two participants are of such conflicting ideologies, and hold such a burning hatred for each other IC that neither would ever capitulate. On an OOC level, however, no sane roleplayer should ever want to actually drive another roleplayer out of the game, or break up a roleplaying corporation.
That is very much the definition of "shitting where you eat".
Once again this is the unfortunate situation that can occur when the adverserial nature of EvE gameplay meets the cooperative nature of roleplay and things do not go well.
That being said, I also have to agree with Mizhara that there are enough stories floating around of just about every RP corp associating with people, flying alongside people, or being engaged in operations that absolutely take a dump on everything their character and nation supposedly stands for that it seems highly dubious that any of them would stick to their guns so brutally as to force a "victory or death" situation.
They seem perfectly happy to commit or endorse the most atrocious things for the sake of scoring a win or avoiding trouble, which does make one wonder why adopting the demands of their sworn enemy would suddenly be a hill to die on.