It highly depends on if the noble in question could be come more powerful than the king or not.
We know Ramslett is good natured and serving honestly for the kingdom, but the king doesn't see it that way, he sees it as a potential power grab by becoming popular with other nobles and commoners.
Because that literally happens throughout history. A popular vassal overthrows the ruler. Or a popular vassal just remains a vassal. How would you gamble if it was your head on the line?
The king in the story isn't some genius, but neither is he incompetent. He's just mid, paranoid and wants to goon.