So, the dichotomy Aggressor/Victim applies to NiSe and Infantile/Caregiver applies to NeSi? Wrong.
Everyone has some aspect of each: Aggressor, Caregiver, Victim, and Infantile. Extroverted ego functions are aggressive, introverted are caregiving. In the superid, the introverted function is infantile, and the extroverted function is the victim function. (I think this idea was mentioned somewhere before, but it's been a long time, and I figured it deserved its own place.) @
Olimpia might disagree with all this, but there's more!
Every quadra tends to see opposing extroverted elements as wrongfully aggressive, and introverted elements as unnecessarily restrictive, potentially microaggressive or passive aggressive, or weak. The reason why gamma and beta got smacked with the aggressive label to begin with was Gulenko's position in the alpha quadra. Of course Se seems aggressive to him. It's his PoLR. It's doubtful, though, that Se in its purest form is perceived as aggressive by the people in the Beta and Gamma quadras. And Si types are quite capable of being aggressive when they want to be.
Power games can exist in any quadra. It's not just about Se and Ni.