I don't know what this logical fallacy is called, but it quite clearly is one.
It's true that you have to content with these things. But you also have to content with them when testing human created treatments. The system is already set up at a basic level to minimize the impact of exploitation and misaligned humans.
What this really comes down to is how more effective a super misaligned AI could be at exploiting the system. But the solution is not to prevent the AI from participating in it, but rather to make the system better.
It's true that you have to content with these things. But you also have to content with them when testing human created treatments. The system is already set up at a basic level to minimize the impact of exploitation and misaligned humans.
What this really comes down to is how more effective a super misaligned AI could be at exploiting the system. But the solution is not to prevent the AI from participating in it, but rather to make the system better.