What lurks behind

Although the case that was shared by the young Major with Canillas might have been known by most of the Terran soldiers, it was his way of speaking in a confidential tone as an action to show a moral principle and sympathy to respect the honor of the misfortuned ladies. 

If this case reached the public's ears and eyes, it would likely be impossible to stop the news from spreading more widely. As a result, there would be less probability of protecting the honor of the kidnapped ladies, as the public would highly tend to judge that they had lost their chastity, even if they might not be touched by the kidnappers. 

It was an unavoidable social judgment that would be faced by those misfortuned ladies and it would likely last for the rest of their lives. Therefore, it was important to keep this sensitive case confidential. Hence, this case was not widely known by others, including Canillas, who came from another kingdom.