The Texas Sharpshooter Fallacy « You Are Not So Smart

If you have a human brain, you do this all of the time. Picking out clusters of coincidence is a predictable malfunction of normal human logic.

We see patterns everywhere, our brain is hardwired to do it. Most of them are harmless or even beneficial. The problem is when people start assigning meaning to the patterns, as explanation of whatever they want to believe or to convince other people of (such as “vaccines cause autism”, which is completely false).