I have a way-out theory: Michael may have been "punishing" Connie for bringing Carlo into the family. Carlo was responsible for Sonny's assassination, which caused Michael to have to return to America and become the Don. Michael knew he had to avenge Sonny by having Carlo whacked. Doing it right after Michael stood godfather to Carlo and Connie's baby was a good tactical move (keep Carlo inside Michael's trap). At the same time, it was cruel to Connie.
Way out there, TB? That's spot-on accurate.
He was punishing Connie at a very sensitive time, which was cruel. But Michael was a cruel man. But at the same time, he was half-wrong in doing so. After all, it was Sonny who introduced Carlo to Connie to begin with
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