Not to sound like I'm looking for an argument but why not start a thread HELPING others with their mistakes?
Most people aren't aware they're making them.
I've seen these threads time and time again, with nobody actually doing anything positive about it, only criticising.
You could even start a section for those who are completely grammar illiterate, help them with letters or job applications?
It's just a suggestion, it's not going to get better if nobody offers the help that is needed.