I personally believe that people have the right to do whatever they please, so long as that freedom does not restrict the freedoms of others.
That goes to say, I think people can and should point out if they think other people are wrong, or hold incorrect views, but ultimately, I am sympathetic to both sides in an argument - both sides should be empowered to take their stance, and do what they please as a result.
If people want to expend time and energy telling other people what to do and think, then go right ahead. Like I am doing now by writing this post.