I'm really suspecting that they want to get rid of him, for both race and the fact that he was discovered to be "moonlighting", but the whole "might be disturbed because he wrote this stuff" is the only thing they can make stick because they don't have an explicit "can't have a second source of income" policy in his contract.
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
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"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor