The Jack Chick marketing plan dates back to the late 1960s and early '70s. The imagery in the "Big Daddy" tract reflects those days.
In the first half of Frame 2, we see how Chick manipulated common racial stereotypes, and conservative fears of "hippies," and Black radicals.
Recall the "professor" asked the class "How many of you believe in Evolution?" The majority of students do. What is more significant is how these pro-science students are illustrated. Reading from the left to right, I have highlighted the angry Black student with his shaking fist raised in the '60s Black power salute, a few "hippie" peace gestures, and those two are also making fists. Out of seven discernible faces, two are Black males, and two are women - a very dubious class composition.
The target audience for Chick's cartoon are the religious right. Conservative, poorly educated Whites who are angry, and/or fearful toward college educated women, and minorities. He uses these images, and "angry hippies" as supporters for evolution.