I don't really see organisations as unethical. They usually don't act ethically, but that's not because as a whole they're unethical.
I see them more like insects. They generally react to stimuli and just do the same as the other insects/organisations, things that have been proven to work. They're also generally driven by one basic instinct, to make more money, and they do it at any cost. The drones (employees) are entirely disposable in this endeavour and if they can entirely remove them from the equation they will do it in a heartbeat.
Even those that perhaps do have some form of ethical streak and don't think they should dump all their employees for AI/robots? Well, good for them, but they'll be driven out of business by those that do.
When you think of a business or other organisation in this way, a lot of the weird things they do start to make a lot of sense.