Can I stick up for the business majors out there.....
In many ways, it is looked at a bit like a science, rather than a liberal art. As long as you can support your point in a logical manner - job done.
Most of the essays I wrote at Uni got the point of the assignment across, but certainly weren't works of literary genius. I actually really struggled in the basic English literature class I took freshman year. My senior year I took a "Writing for Business Majors" and it was by far the MOST useful class I took in 4 years. I had no idea how to write with flourish before that class, or how to use exotic punctuation. I just think some majors don't put the same emphasis on proper grammar, etc.
Now as to why people are just horrible at writing....
I blame it on the internet. The generation of people starting Uni now have grown up with email, texts and chat. People are getting lazier and lazier in their communication. I think that we as an on-line community can help combat this linguistic laziness by not responding to people who don't post using accepted forms of writing.
Half kidding, but it does grate on every single nerve I have when a person's first post is something like this:
"i have a problem. i want to live in the UK how can i do this and whats the whether like. do u have any suggestions 4 cool places to hangout."
That to me is unintelligible and yet we continue to respond to these types of requests. If society accepts this as a proper form of communication, then it is no wonder that it transgresses into their academic life. Don't get me wrong, a spelling mistake or forget a comma in a post, no big deal. Please, please, please use fullstops (periods)!!!!