No. The Belkar of OoTS #1 probably would have. Probably the Belkar of OoTS #300 too. But Belkar's moral arc has had a few really major moments, with the hallucination of Shojo, the befriending of Mr. Scruffy, and his epiphany at Durkon's self sacrifice being the big three. He's on the other side of all of those, and all three are in the way of killing a baby. Especially when it's Durkon's baby.