Nobody is as stupid as you pretend to be. It's impossible that you're still this clueless after years of being patiently schooled to try to correct these basic errors of yours. Salient points, for the umpteenth time:
1. Reporting what was observed is one thing. Reporting one's assumptions about what caused what was observed is a different thing.
2. Anecdotes are not, in themselves, confirmation of the truth of the content of the anecdotes.
3. People make mistakes.
4. People tells lies.
5. People have poor memories.
6. People have biases.
7. Some people are motivated to lie, by money, notoriety and many other factors.