Hypotheses are made for a reason though. Science is still about finding what's true, and ruling out what's not is part of the process/method for doing so. Sometimes all the alternatives to the truth are ruled out and we know the truth. Scientific revolutions happen sometimes, but they still need to explain everything the old theories explained. The newer theories may still be wrong, but in different and hopefully fewer ways. It's important to keep the scope of what's been demonstrated/tested in mind to not be misled about what truths have been established. Newton's physics is still largely true within the scope of everyday experience, for example.