It wasn't a decision we made lightly. As the news arm of a 141-year-old science and technology magazine, we are as committed to fostering lively, intellectual debate as we are to spreading the word of science far and wide. The problem is when trolls and spambots overwhelm the former, diminishing our ability to do the latter.
Good. Science is not democracy. Just because people deny the Big Bang or global warming (and humanity's part in the latter) doesn't make them less true.