According to research conducted by ridley (1999), how could individuals like adolf hitler or boston marathon bomber dzhokhar tsarnaev commit such acts according to the "nature versus nurture" debate?

Well, These individual's behaviors were attributed to "nurture" and influences of their parents. These individuals learned to commit these behaviors after staying in long periods of isolation, according to Ridley. These individuals learned to commit these behaviors due to negative experiences in school or Home, according to Ridley.