You don't understand research, evidence, theory or disciplinary norms. There is no more honest approach to facts, beliefs, truth than one finds in academia. I assume you're a student. You can question your teachers (you can also ask the historian who in history won you that right). You can research something and find another angle of view on it. You can refuse to believe what you're taught, since it conflicts with what your parents, culture told you. However, that is usually invented, mythical, senseless and bigoted. Compare that to the least able academic on earth, and you're better off going with the academic.
1. They are not wrong. They have posited the latest understanding in their field from their analysis of evidence. This changes over time. They then honestly reassess.
2. Depending on the field, they are expressing opinions, based on facts. Fact's don't change, but they are amended. Germany did invade Belgium in 1914. That fact won't change. But we could find evidence that Belgium asked Germany to invade them, for fun. That would change what you're taught, with more facts.