Akagi isn't a backstabber, herself. She's loyally following orders from her superior.
The thing is, the admiral in charge basically explains his plan is to make the Shipgirls' lives as much a living Hell as possible on purpose because he thinks the only way to beat abyssals powered by hate is to have even more hatred on your side... derp. Hence, killing off the only admiral that's nice to them on purpose just to infuriate them. What could possibly go wrong with intentionally pissing off living war machines of power you can't possibly stop?!
Not before I witness all of you sink in humiliation.
Isn't it about time that you let go of that hatred and attachment? *smirk*Go and become a Shinkaisei-kan already.Just how long do you plan to dwell on that, Number Two?