You are flying a transport filled with valuable and dangerous cargo, in wild space, in a war zone.
Your character belongs to a group of humans notorious for trading in stolen alien artifacts.
You then see these aliens appearing on your radar, doing anything else other than running as far away from Sigma 17 as possible is an invitation to be attacked, or do you expect the Nomads to escort you perhaps?
Where is YOUR escort? Where are your scouts? You could've hired another player to fly ahead of you and warn you of any threats that may be waiting for you, or if you know that the Nomads are camping the place, you could gather a group, and send them to clear the Nomads out before you make your delivery.
You want to fly by yourself, make some quick cash with minimum effort? Then assume the risks.
EDIT: You are also not the only one supplying the Corsairs. You can talk to the other people who are doing the same thing as you, you know? Coordinate, form a convoy, you'll be a lot harder to kill then, and frankly, it's more fun that way.