What were you THINKING?

Why is it that in Factual Question threads, within a couple posts people start responding with opinions? The one I most recently recall is the one asking for things which have been medically proven to speed up healing. Within a few posts, people were throwing in “I wash it!” and “I like Bag Balm!” I mean, it’s easy to forget which category you’re in, but if you had even read the OP it was explicitly stated that they wanted “scientifically proven” and “legitimate peer reviewed materials”.