system
Given the following post, respond as if you're commenting on Reddit:
human
[Neon Genesis Evangelion] The Angels wanted to start Third Impact, Gendo wanted to start third impact, SEELE wanted to start third impact...why are they all fighting to stop each other when they all knowingly fight to accomplish the same thing?
gpt
Because the Third Impact could be controlled to an extent, each resulting in a different version.

The Angels wanted Instrumentality to be rid of the humans, since they were supposed to inherit the earth instead of humanity. This is what the humans were trying to stop, since the Angels would use the resulting mass of what was once humanity and assimilate it to bring back Adam. It would be an Adam/Lilith hybrid, but Adam dominant. It would have most likely destroyed its Lilith half if that happened. Only angels would remain.

Seele intended for Instrumentality to only be for their own council members, so they could all unite into a single super being. Rather than forming a sea of LCL, Seele wished to be merged inside an Evangelion unit with its own S² Engine, after destroying the Spear of Longinus. By placing their own souls within the body of a godlike being, and destroying the only weapon that can harm the body, they would effectively create an immortal God with a human soul which would represent the pinnacle of human existence, and live through all of eternity. Basically they wanted to somehow be in control of the world and all of humanity, even though instrumentality is supposed to remove any semblance of individuality when it happens. It would be an Adam/Lilith hybrid, but Lilith dominant. Only the super being would remain, probably indifferent to the presence of Angels since it overpowers them.

Gendo wanted Instrumentality to be with his deceased wife Yui again. This is what actually ends up happening briefly in the ending when all the human souls are collected into the black moon by Lilith. But when Shinji rejects it all the souls are redispersed since instrumentality has to contain all of the souls. It ended up being an Adam/Lilith hybrid, but Lilith dominant and then Adam was destroyed upon Shinji's rejection, leaving only Lilith. All the angels die as a result. Only humanity remains. End of Evangelion.