The mistakes that people make are not subjective. They can detect when they make a mistake, and must do so to correct it. When people make mistakes by using a s

The mistakes that people make are not subjective. They can detect when they make a mistake, and must do so to correct it. When people make mistakes by using a syntactic construct, that's something can be measured, and people do measure it, which is one of the ways they develop syntax preferences. The problem is that we don't ever measure it in an unbiased and representative manner.