Extraction question

Playing the $50 tonight and this hand came up.

UTG(11/6/4/many hands and $60 deep) raises to $2, I UTG+1($98) call w/22, folded to a 50/2/xx donkey(covers me) in the bb and he calls

flop is T 4 2 with 2 diamonds
check, pfr bets $4, I turn my hand face up if I raise...should I raise? I figure the worst hand I'm raising here is AKdd after an UTG raise from a nit and me calling from UTG+1 almost screams pp.

Gotta raise. First, he doesn't know that you know he's a nit. Second, you don't want to give donk BB better odds to chase a draw by flat calling. Third, if UTG has AA/KK a third diamond will kill your action. Fourth, nits have a really hard time folding AA/KK, so you might be able to get it AI on the flop.