It is in the stupidity that is Mr. Collins that this letter was written, he thinks he is being helpful. As for Charlotte well stand by your man. She is probably not of the same opinion as her husband but how can she say anything, she has to live with him, his opinions and the forcefull opinions of Lady Catherine, she made her bed. I am sure she is disgusted by Lydia's choice as most would and she finds fault in the Bennets for allowing such behavior! And even though I agree that the Bennets are at fault, isn't it always the people who have no children the first to speak up on how to raise them. It gives us a glimpse at what Charlotte will have to deal with until death do them part.