I suggest that SB moderators stop telling users to leave the shoutbox or take their discussions elsewhere. There are no rules saying that people can't discuss serious issues in the shoutbox and if there were rules against that they would be unfair and silencing of legitimate issues.
INSTEAD, I PROPOSE THIS SOLUTION: If a select few people are uncomfortable with a topic in the shoutbox that is a perfectly okay topic to have, they can leave or deal with it.
OR, ANOTHER SOLUTION: Implement an ignore feature, or a temporary silence feature. So users can pick and choose whose posts they want to see. Staff, obviously, should not be able to be ignored or silenced by users, since they always need to be heard. But an option like this would be excellent solution so people can continue to discuss what they want to discuss without hearing what they don't want to hear.
"Ignore [username]"
"Temporarily ignore [username] for [number] minutes"