I never like spanking as a punishment to the kids. Either it is because I hated it myself or I get emotionally distressed just seeing how kids suffer the physical abuse. I know I used to be spanked and it is both good and bad. While it allows you to realize your mistakes to justify why spanking was necessary (in the parents' eyes), I don't think I would do the same to my future kids. I do not have the heart to carry out such punishment and see them wail harder which only weakens me more emotionally. I've seen this with the younger kids even my nephews and nieces and it makes it harder for me when I recall being in their shoes.
If anything, reasoning them out and justifying why they were scolded would help better. If it doesn't go any better, give it time. In time they will understand why their parents are trying to correct them. I've gone through a lot and slowly beginning to realize why I was disciplined and even restricted in some ways to anything they deem inappropriate or negative.
Kids are kids. They can be annoying for no reason but I admit that it comes to them naturally. We've gone through this stage before. If they scream in a restaurant or public place however (without any reason other than to annoy), then discipline comes into play (no physical abuse involved and spanking counts as one in my opinion). Giving them leeway by allowing them to do their own things (not even bothering to teach them how to respect especially the public) is not teaching them any manners.