I agree with everything said by CrazyG and ElliotS. In fact there is a bigger problem. Policy trees are very tied to victory conditions. If you play for the victory - you are pretty much tied to certain choices and certain victory conditions based on what civ you play. Not going for Authority with Zulu is also a dumb move. Playing Tourism with Sweden is a dumb move too. If you play Tourism - you always go for Tradition (with one exclusion - Austria). If you play Diplomatic victory - you always go for Authority. If you play Scientific - you go Authority in 70% cases, exclusions are Korea, Arabia, India maybe some others