I understand what you're saying, and I understand the feeling that the Law is the Law and should be respected and enforced.  Unfortunately, some laws are outdated, unjust or unwise.  It is easy to say "change the law!" but awfully hard to do so in practice.  So law enforcement and justice officials have to use good judgment.   Jeff Sessions is ignoring voluminous research and the advice of experienced people in the Justice department and law enforcement throughout the country.  If the goal is a healthy, safe, productive society, his policies are not  aimed in that direction.