Things that people symbolically value are not inherently good. Some of them are vital, never in exaggerated proportion. Light can be blinding, cause burns, irritations… You could totally imagine forms of life which are not founded upon the presence of light. We tend to give too much of an importance to these things, to the point of worship. That's where cult objects come to be harmful. Worship is not intrinsically the activity that have adverse effects. It is the sign of overvaluation and misunderstanding of the thing worshiped.