It most definitely is a worrying sign.  I read posts in moderation all the time that I don't agree with, but very few I ever think of as 'uncivil'.  

I think what's different about me vs. other posters/moderators here, is I'm not so weak in my convictions that I'm scared to hear opposing viewpoints.  I value defending someone's right to say what they want even if it is not part of prevailing groupthink.  Somehow our young generation has been taught that suppression of views that don't agree with your world narrative is 'just'.