Question

What appeal does he show for this?

Answer 1

this would be called a sit-in. in the 1960s-1970s there was a lot of discrimination and African Americans (mostly college students) would sit it at white only restrants as a form of resistance

Answer 2

It shows the idea of racism should be combated

Edit: Pathos, because this picture shows the evilness behind segregation and racism at that time