All things aside, it would be very bad if people playing this game would NOT understand that attacking is a natural thing in this game.
What needs to be balanced is the strategies and dominance balance. But even when that's tuned, I would expect to be attacked and to furiously attack people at my liking, even if I have to attack the same user until the end of the round. :D
Simply because that's strategy... and I would expect the same from any other user. Now, what needs to be balanced on those occasions is the aftermath of that, and if the bigger user is always going to grow more and more, then it's not balanced. If the bigger user, for example, would slowly lose ground against another bigger user, then this could be interesting for Guilds.
:P
Anyhow, eager to see changes and to test them out again.