Maxim 28: "If the price of collateral damage is high enough, you might be able to get paid for bringing ammunition home with you."
Maxim 49: "Every client is one missed payment away from becoming a target and every target is one bribe away from becoming a client."
Maxim 28 is assuming that there is:
a) ammunition
b) home
c) somebody who would buy ammunition
d) that attacking Sirius results in collateral damage and not damaging the mercenary
Maxim 49 is assuming that there is:
a) a client
b) a target
Both assume that the mercenary is able to use the tools required for the job and that tools are available to the mercenary. Attacking one of the main suppliers of technology needed for spaceflight is not a good idea for somebody who needs that technology to do that job.
Attacking Sirius is bad business decision, because it affects the ability of the mercenary to do jobs in the future. Being a mercenary space pilot is going to be difficult if an alien invasion is destroying most of the bubble while humans don't have access to FSDs because some misguided idealists thought it would be a good idea to sabotage Sirius and other important corporations.
<ooc>
Sadly FD will probably never introduce such consequences to player actions. Players will always be able to buy spaceships and the required modules. No matter what they do to sabotage corporations.
Imagine Sirius having a blacklist of known terrorists - those who work against Sirius - and those on the list can't buy power plants and FSDs and can't even get repairs for those things.
Players have too much power in this game to affect the galaxy and the real powers are absurdly weak.