I have never had a student who missed class often do well in one of my courses. When I started imposing an attendance policy in my freshman and sophomore level classes the pass rates went up. I believe that students have an obligation to the tax payers to go to class as needed, and that in my present context I have an obligation to make my students show up.
"The teacher is not to serve the pupil; rather, both are the servants of their culture."
Herman Hesse (1877-1962), from The Glass Bead Game.