Why kids can't take opinions?

Minecraft isn't that bad. But tell'em that opinions may vary, give then examples or at least calm them down if they're still screaming

It is not a fact that it is bad technically.

Is there no discipline there?
Tell them to stop screaming

Just let them be kids unless they're your own children and they're actually 22 years old living in your basement with no job or aspirations.

Did you explain why you think it is bad?

Why are you telling kids something is bad for them? This is the job of a parent. You did not say in my opinion you said it is bad so don't do it I'm willing to bet. That is not an opinion that is trying to manipulate. They do not want to be told they are wrong about anything they enjoy. If you are trying to change a family dynamic and you are not part of the immediate family you have lost all espect from these kids. You ae not there parent you have no right to say what is or is not good for them. What do you do? You leave them to do what there parents allow them to do end of story.

Learn the definition of EMPATHY