Normally don't like responding to rage posts, I'll lead off by saying I agree with you personally that Mansour strikes me as a lot less sketchy than RA.
However, the parallels are that both clubs are owned by successful businessmen whose wealth originated from their home country - one is an oligarch and one is a royal. Both of these owners are still perceived as significantly involved in the governance of these countries, Mansour is in the royal family of a functioning monarchy, for example. From there, it's pretty straightforward that if the foreign affairs of one's home country can lead to sanctions that ruin a football club's ability to operate, the same could happen to the other owner/football club.
As has been mentioned elsewhere in the thread, this seems unlikely to be an issue with the UAE, and that's something we should be thankful for.