My concern with the tolerance approach is that I have found these same errors occurring with greater frequency in my own writing. It appears that what I read affects what I write, and I read a lot of "loose" vs "lose", "it's" vs "its", "there" vs "their" vs "they're" errors on the 'net. So when I find someone contributing valuable insight marred by such errors, I try to politely and gently suggest greater care in avoiding said errors.
However, I did not intend to start a week-long digression on the topic of typos. ;)