Why are the traits for a successful criminalist important?

if you want to be a good criminal then u should have very interesting traits but not too specific that they give u away. I live on the east coast and my friend always leaves a seashell on a shelf that he steals from lmao. Pretty cool. just think up fun stuff to do to give urself interesting traits and if u like to write fiction then it could give u awsome ideas for a bad guy in one of ur stories. that's what i do at least.

Seriously that is one stupid thing...lol. first of all this question asks about "criminalist"(forensic evidence). these are the people who work for the police, they solve cases.