Why does horde have to always lose AV?

It seems almost set in stone now. Even at the beginning of the game, everyone is prepared to lose.

I'm thinking, is it the mindset of the players, or is AV somehow skewed in the alliances behavior.

I'm guessing it's just a mindset but you still wonder what it could be...

With this I would like to encourage horde players in AV to defend bunkers from backcappers with at least 5 people or so, and for others to backcap rather than just run around, expecting to lose