I guess it depends what you consider "fight". If by fight you mean war, I would never fight. I think all conflicts can be resolved without war.
If by fight you mean standing up for what I think is right, and generally doings so through non-war methods, I guess I would fight for any and all of those in the list. If it's 1 or 2, no question I would "fight". For 3, 4, 5, I think I would need another reason, other than "because it's happening", either that it might affect someone I know (or myself)orif if it's an issue I generally hold an opinion on.
For example, if somebody treads accross my neighbour's lawn once or twice, I likely won't run down and stop them, because it doesn't affect me, nor do I care much about the immorality of the trespasser's actions. But if that person does it every day and starts to wear a path on the lawn, it become more of a moral issue that I might want to voice my opinion on.
Simplistic example, but it's the only one I could think of right now. Sorry.
Obviously, having a jumbo jet driven into my towers, killing thousands of people is a whole other scenario, on which I don't feel able to voice a real opinion. I'm just not informed enough on the whole international conflict/terror issue, and it's such a colossal issue. I don't think I would have rushed out to bomb someone right away, had I had the power. But that's the U.S. for you. Clinton did it. Bush Jr. did it. Others will do it in the future.