Totally agree with Nightmare, it is so low to attack rss tiles in the first place, many players really need those resources and i often see much superior players preying on lower players yilding, while they are shielded up. If shield was not possible while an attack (ANY form of offensive act) it would be lot more fair and give lower lvl players a chance to get help to attack the attacker.
There are several related topics on the forum which mention fairness and bullying.
Often the response is along the lines of its a war game,not farmville and aggression is to be expected.
In fact,the game relies on, and reflects real life behaviour, where the stronger people who have enough, and do not need more, take advantage of those who do not, may need the most,and for whom a little goes a long way.
A lot depends on the development stage of the kingdom and the people in it ,or if a competition is ongoing, generally speaking there are enough tiles and invaders and ghosts to satisfy everyones needs without tile hitting or stealing of weakened targets from less abled players.
However, a stable peaceful kingdom may not remain so,and in a kingdom where there are rules against such behaviour some will do it because they can, its fun, or they are otherwise bored.
Some complain about the poor content of Lokis chest.
Yet mostly strong aggresors will gain little from the much weaker player,but with the excuse a lot of little makes a lot.
The irony of it is, that taking from from others is just another form of farming.