Why might the biological approach to personality be controversial for some people?

     The biological approach to personality may be controversial for some individuals    for numerous reasons, but one reason in particular is that it has become evident that personality does not solely develop as a result of biological and genetic factors. The environment or environmental influences also have a significant role in the development of personality, and may have a greater role than biological and genetic factors. Personality develops as a result of the interplay between biology, genetics, and the social environment. Indeed, biological and genetic factors influence personality; however, humans possess the capacity for challenging and sometimes overcoming biological tendencies (Friedman & Schustack, 2011). For instance, biological tendencies of aggressive behavior can be overcome by means of environmental influences.

Reference

Friedman, H. S., & Schustack, M. W., (2011). Personality. Classic Theories and Modern Research (5th ed.). Allyn & Bacon.