Any tournament is high pressure. And at that level the pressure is higher. Even Kasparov said that it took a sound trashing at one tournament to wake him up. But so long as you fight, there is still a chance to turn things around. You just need to find the real reason for the collapse and deal with it. In fact Kasparov himself talks about the psychological problems he had with certain positions.
The trick is to learn how to handle those pressures. Not run away from it. When Nichol David plays for Malaysia she has to handle the pressure of the expectations of the Country.
The problem becomes terminal when we run from tough competitions. When we start to manufacture numbers, when we quit.
The fighters do not need to apologize. They have courage. They just need to ask the right questions. But the solution can never come from the quitters.