To start I'd probably remove disturbing comments and close the thread (turn off commenting), then I'd reach out to each member and explain our motto, code of conduct, and ask them to please help us keep the community clean because we'd hate to lose an active member but would have to ask them to take a step back if it continues.
If that doesn't work because they post nonsense again I message and ask them to take a break by logging out for a week or two. After that, I'd tell them they are no longer welcome and ban them.
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To start I'd probably remove disturbing comments and close the thread (turn off commenting), then I'd reach out to each member and explain our motto, code of conduct, and ask them to please help us keep the community clean because we'd hate to lose an active member but would have to ask them to take a step back if it continues.
If that doesn't work because they post nonsense again I message and ask them to take a break by logging out for a week or two. After that, I'd tell them they are no longer welcome and ban them.