The rainbow is a universal symbol of everything good, also children. Don't you think it's possible to sue the LGBT for illegal appropriation of universal symbol?
The rainbow doesn't symbolize good, bright colors are a tool of the devil to fish for dumb people in order to turn them against God. Looking at the old folklore, what do we know about the rainbow?
First thing that comes to mind is "there's a kettle of gold were the rainbow hits the ground". Of course, the rainbow is a light phenomena in the sky that never actually hit the ground, which means it'll lead greedy pigs out into the forest, or on a swamp while looking up at the sky. These people will eventually get lost, or worse, fall through the ground and drown by not looking were they set their foot down.
Then there's the garden of Eden and the big colorful apple, which the devil in shape of a snake tricked Eve into eating, despite Gods order not to eat that satanist fruit.
Don't bother. Bright random colors is and has always been owned by the devil. Let's focus on reminding people about that to help them identifying evil.