Corruption in the sports sector is linked to the political system where the entire government, from election to governance, is corrupt. This has affected the sports activities in most countries and even the premier league.
FIFA and other sport governing bodies are not left out in the corruption.
Could be the case but most of the time it is an isolated case. Now that I think of it, you are probably right, if the political system is corrupt then that means that they are tolerating corruption in other aspects too.
It's only an isolated case because only a few have participated and it's hard to detect corruption in sports. But, in reality, even one person would rig a game, he can make millions of money depending on how valuable he is on a team, a star player gets more minutes so he can help in rigging the game for his favor, whether he lose or win in a particular game, what matters is he serves the purpose to win the bets on the sportsbook.
If my two cents are of interest, it is not an isolated case. Corruption in sports comes in all shapes and forms. Whether it be relatives of sports players betting on certain outcomes or top level corruption like giving the World Championship to Qatar.
Everyone in his right mind knows that the WC given to Qatar was fishy. If these corrupt networks work thoroughly in conjunction with consulting of the best lawyers out there, there is almost no chance to catch them. Even if you catch them, that is also taken care of as these guys know in advance whom to get on board should things go wrong.