Rainbow
The rainbow flag has become a symbol of the LGBT+ movement and everyone around the world knows it well. Apart from that, we just really like rainbows and when we see them appear in nature we can not help but just stop and stare at them. Who doesn’t like pretty colors?
When these vandals saw white lines they felt a need to just get out their markers and make rainbows appear in front of their eyes and for the whole world to see. Spreading some color is a good thing, we are not sure if this counts as vandalizing the American flag, but we will leave that up to the police to figure out.