Encouraging Discussion:
Just consider your blog comment section only have "great post", "nice article", "good attempt" etc. Is it not make your blog post boring? Definitely Yes. So Whats encourages discussions among the readership, "Negative Comments" which makes your post live. I always allow negative comments on my blog because i know their will be two commenting parties one will be in favour and other will be against which will share thier views. So Negative Comments actually an real method to drive traffic on your blog.
Your Readers Will Never Leave Your Site:
Now i am going to share my own example I,ve had commentators who post that my site is worst and they are going to leave my site and will never come back but after some day they are accusing me again on another post. So What does i actually want to say is nobody can completely left a site . they may not visit your site for a while but its rare for someone to never back.
How to Handle a Negative Comment:
Best way to handle a negative comment is to thank commentator for making it and then address his actual concerns or problems. Never flame your reader who search your blog and flames you. It will be highly unprofessional if you flame back your readers. Never treat negative comments as bad thing. because it symbol of the growth of your blog and it indicate that you have done something right. If you never got any negative comment it means something is wrong with your blog and people dont take intrust in your blog. Hope you got my point. If you have any query feel free to ask me via comment box given below. Stay Blessed 
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