It's not even about these individuals being evil or not. I'm sure most of them are torn to pieces (before they become numb) when they make decisions against the wellbeing of the workforce. The point is that the managers would not be in these positions if they could not fulfill these roles — they would be replaced. These positions self-select for "evil."
The people who optimize externally for profit focus not on squeezing the workforce, they focus on squeezing the public. These are the lawyers, the salespeople, the accountants, the marketers, the compliance experts. There's no point debating the evilness of the individuals, but their roles are necessarily evil. These roles tend to grow more and more evil as the capitalist enterprise grows. The enemy here, then, is capital, not these poor workers who fill necessary capitalist roles.