The event is not about the class,
it's about scum that's roaming the galaxy and clients hiring PEOPLE to clean up that scum, dead or alive. When you get hired for a job like that it makes you a bounty hunter since your HUNTING other people to get the BOUNTY (cash) that was placed on that person's head.
The clients often also don't care who does the job as long as it get's done. So how could a trooper not do this? or a jedi? or a smuggler? Even sith, be it warrior or inquisitor, may want to do this just to show off their power to make the galaxy fear them even more and hell they make some money doing it.
Also all the other classes kill and capture people in other missions right ? so why not for a little bit of extra money or just to get rid of yet another villain.