Not to mention that chemistry, biology, physics, and biochemistry are liberal arts majors. Everyone leaves off the “and sciences” part of “liberal arts and sciences.”
There’s nothing “less classical” about a biology, physics, biochemistry or chemistry major; people have been studying those subjects far longer than we’ve formally studied literature or political science, and before the English language actually existed. The natural sciences are some of the original topics included in the classical liberal arts education - the education necessary for a free citizen to participate in a democratic society.
Also, thinking only of positions that are directly related to majors (history → teaching, English → journalism) is unimaginative. Bachelor’s degrees aren’t vocational degrees; the idea is not to train you for one set of jobs but to train a student to be adaptable and ready to take on a variety of jobs. There are humanities and social science majors (and natural and physical sciences majors for that matter) in all kinds of jobs, both directly related and completely unrelated to the original field of study.
Lastly, money isn’t the most important thing to everyone. Some people are quite content with average-paying careers. I can assure you that $50,000 is not the smallest salary upon which you can live comfortably, especially not in lower-cost areas of living. (I lived rather comfortably on $32,000 in Manhattan.) However, most college graduates - regardless of their major - will make at least $50,000 a year within a few years (5+) of graduating college ([Source 1](Box), [Source 2](WSJ.com).)