Can you come up with a theory off the top of your head why governments might have "accidentally" failed to patch a huge hole that their wealthy backers benefit

Can you come up with a theory off the top of your head why governments might have "accidentally" failed to patch a huge hole that their wealthy backers benefit from? I have news for you, in a democracy in which bribery is illegal, these loopholes can be closed by politicans who actually want to.