First and foremost this isn't an alliance. It's a Movement, To move away from the the care bear (LLJKA) mind set and go to playing a game and fighting. I don't much care for stock pilling. Yes you have protection sort of. But at that point it makes it so that people who have more members Can out produce smaller factions and eventully just over run them.
Let us say there is a Clan called Corgi. and another clan called Tiger. Corgi have 20 fairly active members and has two villages. they ally with Tiger who have 50 semi-active members and two villages. they both care bear But sense the 50 member state has over twice their members their members they can make twice as much equipment and goods compared to Corgi. even though they aren't as active.
Let's say these two factions go to war Corgi will have an army of 2,500 unit's Armed with Mail a few good shields and decent weapons. Where as Tiger will have 5,000 troops, armed with High Quality weapons( due to the extra gold and crafting from the extra Players.) and much better armor.
Thus Tiger Wipes the floor with Corgi even though they are more active usually then Tiger.
and Thus we see how Care Bears work for Big people Like LLJK, But not so much for little people like Hate.