I have seen this phenomenon over and over again of rainbows appearing after devastation. I saw it the evening of 9/11 here on Tybee. A huge double rainbow appeared after Tim Russett's funeral after someone in the service mentioned about how Tim felt about rainbows. Always, to me, a rainbow seems to be saying, "I know things look dark and sorrowful, but there is a bigger picture, and it is all about love."
In that shared moment in Queens when all those human hearts simultaneously felt relief for a short time, who knows what was born out of that "time out" that the rainbow provided. Surely, it had to do with feeling the 'something bigger' that loves and supports us, no matter what. For the faithful and the spiritually inclined, it would be called God or Creator, or Source. For atheists, it would probably not be called anything, but would be felt, nonetheless. I don't think it is possible to see a rainbow and not feel uplifted. Enclosed is a double rainbow from my small island from this summer. I too gasped when I first noticed it. I always do.