you gotta remember they are ghouls they are used to their friends being killed especially uta who was the leader of a violent ward at one point. he wasn't close enough to kaneki to cry over him or anything. they did say it was a shame he went out like that and he did go to help in the kaneki rescue missionNo Kaneki didn't have a chance to defeat Arima even being level-headed. Even so, he could've gotten away or at least the battle could've turned out not to be such a curbstomp. And I don't really think Uta ever cared about helping Kaneki. Just look at this:
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Speaks for itself.