It is well-known that top-conferences had and still have many problems. Some examples: There used to be the problem with authors adding new co-authors after acceptance, aka "selling seats". There is a debate about how many papers one should be allowed to submit, as some people with money and influence are heavily franchising. It is unclear to what extent there is implicit and explicit reviewer collusion. Even double-blind reviews don't really solve the problem.

If we don't admit that there are fundamental problems that affect all of us (academics) and instead pretend it is only the lesser people who f things up, we'll all be screwed sooner or later.