Impulsive5 you might be able to hide it with custom CSS. But then admins will also no longer see it.
I don't remember if the extension checks for permissions before showing items. This button is not about seeing soft deleted content, it's about whether they can soft delete their own discussions. There is probably not much sense mass deleting your own discussions without being a mod, but from the extension point if view it's the same as any other action.
