THey fully know that they are being used to make more money for these human right abusers.
Every so often in this thread some braindead idiot makes some version of the following argument:
"Do you have the same morals in all areas of your life? Or do you use an iphone? Wear Nike clothes? How is your laptop made? Where does the petrol in your car come from?" Etc.
Which is an obviously stupid argument because absolutely nobody with an ounce of common sense thinks the moral standard required to object to someone owning the football club you support should
also require you to give up things actually required to live and function in society, or force you into major life decisions. These are not comparable things.
The example of your friends' jobs fall into the same dynamic. They need to work to actually live and function in society. And while they could possibly change jobs to one that isn't in some way connected to oil states, that would be a
massive life-commitment to make for moral reasons, and a wildly impractical standard to expect people to live their lives by.
Which means it's not at all comparable to the very minimal moral standards required to take the position (almost totally consequence-free for your actual life) that "Qatari state ownership of Manchester United is bad and we should be against it". It's a very low bar people are failing to meet, which is why they are (and will continue to be) criticised as overly amoral.