Having the natural instinct or desire to be a husband and a father, doesn’t mean you shouldn’t be a priest. They aren’t, in themselves, contradictory. It only seems that way, because you can’t be married if you are a priest. But the Lord (and the Church) needs men who have all the natural desires to be husbands and fathers. With the grace of ordination, the Lord is going to focus these important attributes to make that man into a spiritual father who provides for, protects and nurtures the family of the parish. If you think about it, the natural love and care a father gives to his children are very important assets that a priest carries over to his calling.