"Child labor" is, generally speaking, work for children that harms them or exploits them in some way (physically, mentally, morally, or by blocking access to education).
Child labor is preferable to going to school
The passage says child labor blocks access to education. It cannot be preferable to going to school
( z1 prefer :ARG1 ( z2 labor :ARG0 ( z3 child ) ) :ARG2 ( z4 go :ARG0 z3 :ARG4 ( z5 school ) ) )