No one is willing to wait and see how it fits in with what else we know. Scientific knowledge is built one piece at a time, the result of many studies over long periods. Experts analyze the findings, throw out odd ones and accept those that point to the same results time and again. All studies are not created equal. My best advice is to look at everything with some skepticism.
Different methods result in different findings.
If a group of people is observed, for example, scientists can only spot trends and make educated guesses about why they're happening. Laboratory scientists must follow up, designing experiments to test the theories. But while this adds to the body of scientific knowledge, it also exasperates people who read stories about the first theory and take a knee-jerk reaction. Butter has saturated fat, which is hard on the arteries and can contribute to heart disease, while margarine has unsaturated fat. But later research found margarine also has transfatty acids, which can cause cancer.