Blackmailer LP question / aside about Kidnapper skills overlap

Is it just me, or does it seem odd that the Blackmailer LP lacks the Extortion skill? According to its description, it would be the skill of choice for blackmail. Also, why do Kidnapper and Blackmailer have nearly identical skills? It strikes me as bizarre that two Criminal LPs are so alike yet BE has something like four completely different Student LPs (not including Foundation Student).