I'm definitely going to "dismantle the system" if given the option for an ending.
In one of several (15) endings, you will have the opportunity to organize a revolution (an uprising of oppressed workers). In fact, preparations for the revolution have already begun and it's all up to your choice.
However, I wouldn't be surprised that such an outcome would be more devastating to the world than a relatively peaceful (no mass casualties and destruction) takeover of the corporation by GoodDomKane and GoodOlivia, followed (I hope) by positive changes in the corporation, such as better working conditions, narrowing the income gap between the elite and ordinary workers, banning human abuse, etc.).
Has it ever been explained why the class system is necessary? Abusing "slaves" and the severe class divide. Is it just because of the world being post apocalyptic and wealth inequality?
As for the reasons for the class stratification - you can pick any, but yes, the post-apocalyptic world, the lack of food and energy, and the tight monopoly of some corporations (including the Karlsson Group) on all these resources on which the survival of the world depends, have done their job.
Besides, in the Karlsson Academy all the female elite and their numerous assistants are thoroughly brainwashed from childhood, convincing them that they are the superior race and masters of life, and ordinary people are just miserable cattle and their slaves.