How come so many people are unable to spell simple words?

[Mummelmann]

AZWification said:

Mummelmann said:
"Could of", "should of", these are some of the most common and insanely annoying mistakes made on forums. How do people who are otherwise good at writing get this horrible linguistic misconception into their heads?

I wonder if the people who make those mistakes are even aware that they are mistakes.

Good question, we should of asked them.

I think the main confusion is the fact that it's pronounced "should've" in most regions, it could be misheard and then written as "should of", the same is true for "could of". But people with a basic grasp of the language should know the difference simply by seeing the weird context in which "of" is being used in these two instances, there is zero logic behind when you see it in writing.