We live in a society where passive, ubiquitous, voluntarily-accepted monitoring is becoming the norm because of the vast convenience it affords the users. The flip-side of that coin is of course breaks in your regular pattern of behavior are going to show up in the data trail.
Rather than blame the data trail, maybe we can just all agree to a societal understanding that if you're going to take up murder as a hobby, it might be somewhat incompatible with your other cloud-based ubiquitous-computing hobbies?