Decrees of our Sages

Question: Why did our Sages prohibit eating chicken and milk together? Why didn't they have more confidence in us, as surely we can tell the difference between fowl and meat? Furthermore, why was this decree not extended to fish as well?
Answer: This is a general question regarding all of our Sages' decrees. They did not enact decrees quickly and did not want to burden people. Rather they saw what was happening in reality and based on what they saw, warned people.