In some ways, letting them get away with things at church might be more than just bad, it might be detrimental. When we allow children to put their needs before God's or when we let them think that they can disrupt worship, we are passively teaching them that church is not about God but about them.
In an article I recently read, Greg Stier writes about 5 Reasons Jesus Would Be Fired if He Was Your Youth Pastor. I think all five reasons (well really four) were helpful to think about, but his number 1 reason kept me thinking. Stiers says that Jesus would shrink the group before he grew it. I don't think Jesus (or Stier) would do this just to keep the numbers down. It's more about seeing value in the quality of the group over the quantity. In other words, if we really want to do ministry as Jesus does it, we might think less about what people want and more about what is good for people. This, of course, includes grace, love, peace, and acceptance. However, it also includes speaking truth, rebuking, and working through conflicts.
We know that when we love someone, we do more than just be nice. We get involved, things get messy, there's some conflict, but we love them enough to work through it. We are called to love our children and youth this way. We are also called to love one another this way.