The etiology of criminal behavior

After spending the entire semester examining the many theoretical points of view regarding the etiology of
criminal behavior, what are your thoughts regarding the final reading which basically suggests that
everything we've been studying is far less influential than an environmental factor such as lead? Do you feel
ripped off? That you wasted your time this semester? Are you awed that something SO tiny could cause
such harm? Concerned that there's so much more that might yet to be discovered regarding the impact of
other contaminants/substances that we might be exposed to on a regular basis?