The problem is the conclusion that we must allow this so that their business economics can be sound, so that they can continue to exist. We should instead conclude that being horrible to people is bad, and any business model that requires it should not exist.
Brian saw a company that he knew ahead of time was horrible to people, that he knew ahead of time decided that many of their customers must die, and indeed this was critical to the company's economics and business model, and thought, 'You know what? I want to be a part of that. I like that so much that I want to be the one in charge of it.'
Why that job, instead of the millions of others? Well, we can take a gue$$. He had to make his nut, no matter who he hurt along the way, right?
Meanwhile, as an arguably less-horrible person, I see a job posting for startups that use AI to scan terminal cancer patient records for timely funeral business leads in exchange for offering crypto credits that can be applied towards a coupon for palliative care AI chat or whatever, or makes drones and AI systems for tracking and identifying government critics for later persecution, and I have to click 'next' because my soul is worth more than the salary. What a fuckin' chump I am.