You should be prepared to take over for a floundering group today. The members of this group are not quite as mature as you are, and they need to be led along like children in a kindergarten class. You need to be the grown up in this particular scenario, and you should not feel like you have to sugar coat what you have to say. Tell it like it is—you'll waste less time, and you'll get more accomplished. Making everyone feel comfortable is not your responsibility.