I agree that for many it's intellectual laziness. Though I also feel that many choose to appear intellectually inept for cultural reasons. Many readers are not as articulate or verbally 'cultured' as most authors. So it would be rather pedantic to try and be perfect about things.
Personally, I try to employ both traditional and a culturally current method of writing. It has become my writers "voice", and appears to garner appreciation from many generations. Especially in my own generation (Millennials/Gen Y).
Also, I do believe there are many hubbers who use English as a second or third language, and many probably don't realize they are being grammatically incorrect. It's annoying, but I can be empathetic as I am certainly not skilled in any other language except English, lol.