Theory o' Mind

The ability to recognize the perspectives of others is a pretty crucial skill for human beings to have. If one cannot recognize the thoughts, emotions or motivations of others, it will be quite difficult to form interpersonal relationships, which could affect one's ability to hold a job (depending on the job) as well as one's ability to interact with others on a daily basis. Additionally, if one cannot fathom the existence of any consciousness/emotions other than their own, then they may view their actions as relatively consequence free-- if nobody has feelings but you, you can't possibly be hurtful to others. They can't be hurt. Additionally, if you are the only one with drives/motivations, your actions are the only ones that matter, regardless of how they may affect anybody else, and your needs are the only ones that must be met. This egocentric mindset could lead to social exclusion as well as risky/dangerous behaviors in some cases (which would, of course, lead someone into further troubles with society at large).