Because I read UTA as intel, and the whole delaying of the lynching of coffee was his way of protecting himself, but the mafia would know everyone in that protective circle, so can just lynch elsewhere while still maintaining the cover of cooperation. Originally, because of the interaction between coffee and luna. I also thing we could gain a lot of information by his death, in his interactions with solaris, and probably several others.
In a pinch, I'd also be ok with lynching dawn.