Sinclair's arc of eventually ending up as Valen (and giving up his human existence for this) is all the more powerful if you consider he must have gone through a phase where he hated every Minbari he saw. Now obviously by the time we meet him in B5, he's not just past that but actively interested in working for reconciliation, but yes, he probably dug up some emotions he at some point felt though knew to be wrong in order to fool Malcolm.