Some people really get nervous when they see joy. It's a sad fact, but an even sadder fact is that sometimes they try to squelch that joy to feel better about themselves. It takes all the courage in the world to not let that happen.
Let the light shine brighter on them so they can see their own darkness.
It's the only way someone can grow.
Think about it: if you take on their dark, then there's more darkness but if u hold onto your light, well you know.