In no other profession are you as inherently safe as trading. You do not make credits from engaging in combat with risk of death constantly. Also the rewards are so great that if you do die and lose a cargo load, an hour or 2 back on the job and you are back even. Try to do the same pirating and die and see how long it takes you to make your rebuy back. Upgrading works inversally for pirates than trading by the way. You cap out how much per hour you can make quickly while upgrading your ship past a certain point will only cost you more on rebuy, yet profits cease to rise. This will simply help out players who enjoy pirating to make more money, yet still not get close to traders amount or lack of risk.
PS
When you RETURN an item you stole from someone you are essentially laundering and SELLING back an item covertly to a large operation that does not realize you STOLE it.