What's the downside to claiming Intelligence? Mafia already knows they need to kill all non-mafia, so I don't think finding out who is Intelligence paints a bigger target. They can find out secondary roles with Search, but not primary. Sure, lynching Intelligence > Town, but a chance at lynching Mafia > no chance at lynching mafia. Where is the down side?
(Yes, I understand you wouldn't be a confirmed Intelligence player, so Mafia could claim it, but then they're asking to be Searched and when found lying would likely be lynched as a result. And town has no reason to claim Intelligence that I can think of.)