KK with action and we don't close the betting

[Nick C]

UTG's turn donkbet certainly is a nuisance, but I think you should let it go, unless CO's play (and the play of the table as a whole) is more maniacal than you've made it sound.

If the table has been maniacal, though, then this could be one of those spots where you call down no matter how much it costs and pray. But I don't think "very active" is good enough here.