It's 100% true that the Roy siblings did not choose to be Logan's children and Tom and Greg and the old guard did choose to work for him so their relationships to Logan are fundamentally different, and the degree of culpability they bear for their own moral degradation is also wildly different. But workplace emotional abuse is also very real and omnipresent in the way Logan treats the people who work for him. And one of the impacts of workplace emotional abuse is creating an extreme attachment to the abuser and becoming less cognizant and even defensive of their abuse towards yourself and others, and in cases where the emotional abuse is institutionalized and systemic it can also create a strong aversion to leaving because your whole sense of personal identity becomes wrapped up in the organization and so being forced to leave can cause an intense psychological crisis. I don't think the situation of working for Logan is at all equivalent to being his child but I also think that it's a bit misguided to imply that Tom and Gerri and Frank and Karl are operating from a place of pure rationality without any undue psychological influences when they make the choice to stay with and support Logan