Your comparison is unworkable. People really can kill one another, but only God can condemn anyone to hell. I can threaten people with hell all day long, and they can ignore me. Same with the Church. The Church doesn't do anything but report what Christ says he will do on judgment day. And, by the way, Jesus talked a LOT about hell. A lot. 

In any case, you havent demonstrated that Jesus was uninterested in "doctrinal consistency," whatever that really connotes in this context, nor have you rebutted my point, backed by Matthew 19, that amidst the scribes and Pharisees, it was our Lord Jesus who took the hard line on divorce and remarriage, against the more "pastoral" approach of the Pharisees, who after all, allowed divorce and remarriage.