Why can't educated people use words like "your" and "too" correctly?

[Gemi]

You might as well ask why some people cook with butter instead of olive oil or why others don't buckle up their seat belts or why some spend more money for blu-ray movies when the quality is exactly the same as a dvd....

It's choice. People have different value systems. Some value proper grammar more than colloquial speech. Some even think it's more trendy to speak in 'text speak.' It's the same as how people spend their money. Some value having nice material possessions while others spend their money on foreign vacations instead.

I'm not concerned about their proper/improper grammatical usage or punctuation usage. Clearly they must recognize how to use it properly if they graduated in the first place, yes? If not, then shouldn't you be more concerned with how the education system has grown lazy enough to pass people who clearly weren't meeting minimum academic standards?

P.S. Doctors can't even write legibly let alone use proper grammar...so that just shot your "if you want to get anywhere professionally you have to ..use correct grammar" theory in the foot.