It's because these opinions are asinine and inflammatory. Note that I wouldn't like a liberal doing the same column about conservatives either. It's stupid. Everyone wants the country to be better. One side or the other isn't 'better'. The country needs both sides' ideas to grow. The us against them mentality has to end.
I could go through point by point and talk about why his opinion is ridiculous, but that'd be a huge waste of time. I can't refute his facts because he didn't include any. It's an opinion piece.