Yes, the ubran myth that rice kills birds is all false...
The real reason chapels and churches don't want you to throw rice is because it's incredibly hard to clean up from the grass and all the other little cracks and crevices, and thus the leftovers will attract all sorts of vermin and birds... In a short time the area will be crawling with pigeons, rodents and other birds looking for a free treats especially when they see people gather all the while pooping everywhere and likely also disturbing future weddings... Just look at some videos of people in the city feeding pigeons and imagine that happening at every weddings...
