Who killed Marcie Part 4 - Appraisal

Marcie Fuller Swinford deserves justice.  As do many missing and murdered victims.  Surely, in a free society adults have a right to be missing, to run away, or start over.  But where does that right end as the families and loved ones fear for their well being?  That is why many states have adopted laws forcing local law enforcement to investigate adult missing persons cases, so the critical time and evidence isn't lost in the delay.  But still some cases seem to get priority over others.  What makes one life worth more than another?