Question

Read the lines from chapter 22 of The Adventures of Huckleberry Finn.

Then at the bottom was the biggest line of all, which said:

LADIES AND CHILDREN NOT ADMITTED.

"There," says he, "if that line don't fetch them, I don't know Arkansaw!"

Twain is most likely using humor to convey his viewpoint that
people are often tempted by the thrill of something naughty.
people are often too ignorant to know when they are being fooled.
liars and swindlers will stop at nothing to make fast and easy money.
liars and swindlers are often considerate of the feelings of others.

Answer 1

people are often tempted by the thrill of something naughty.

Twain is using the “Ladies and Children Not Admitted” sign as comic reverse psychology — mocking how “respectable” people are drawn to forbidden amusements and revealing social hypocrisy and curiosity.