Don't want to get plundered? get strong.
Don't want to bother doing things right like waiting months farming resources for getting stronger correctly? Go play another game.

Plundering is one of the very few activities that give free coupons for everyone who is good enough (or for everyone enough smart to use your alt correctly).
All those people quiting because they get plundered wouldve quit too because they don't win wars, because they get farmed in sage world, because they can't do matsuri, etc.
This is a PVP game, find the way to make a place for yourself on top of your server or find another game, Naruto Online is not for you.