Why doesn't Ramon's father want Ramon to sail with the fleet?

Ramon's father does not want him to sail with the fleet because he fears for his son's safety and believes the dangers of the sea outweigh the adventure and excitement. He likely has personal experiences or knowledge of the risks involved, which makes him protective and cautious about letting Ramon take such a perilous journey. Additionally, he may want Ramon to pursue a different path that he considers more secure and promising for his future.