What are you implying here? The answer to the nature vs. nurture debate is "both", see "epigenetics" for more.
When considering the influence of a parent with morally reprehensible behavior, it's important to recognize that the environment a child grows up in can indeed have a profound impact on their development. Children raised in households where unethical behaviors are normalized may adopt some of these behaviors themselves, either through direct imitation or as a response to the emotional and psychological environment. However, it is equally possible for individuals to reject these influences.
Furthermore, while acknowledging the potential impact of a negative upbringing, it is critical to avoid deterministic assumptions about individuals. People are not simply products of their environment; they possess agency and the capacity for change, and we need to realize that not all individuals perceive and respond to environmental stimuli in the same way. Personal experiences, cognitive processes, and emotional responses can lead to different interpretations and reactions to similar environmental conditions. Therefore, while the influence of a parent's actions cannot be dismissed, it is neither fair nor accurate to presume that an individual will inevitably follow in their footsteps.
As for epigenetics: it highlights how environmental factors can influence gene expression, adding a layer of complexity to how we understand the interaction between genes and environment. While the environment can modify gene expression, individuals may exhibit different levels of susceptibility or resistance to these changes based on genetic variability.