What is wrong in criticism

When people can post topics in appreciation of actors and their personal lives..like how cute their family is or kids are...blah

But then why criticism is not allowed....

If it is genuine and not abusive or offensive..

Why is discussions not allowed

Looks like you are new to the forum . The forum has all kinds of post from appreciation to constructive criticism . If you are referring to IF rules then you need to check with the moderators .