Mostly do you like to get right in the fight, sit on the sidelines and watch or be left entirely alone because you don't care?

All the above. There's a time to fight with all your might but you never enter the fray without knowing the adversary or what's at stake. There are times too, when discretion is the better part of valor and your place is on the sideline. It could be that someone else brings something to the fight that will increase the odds of success. In the third scenario, if I find that I don't care, it certainly isn't something I'd fight for.

For the most part, I don't care.  I know people who have to jump into every fight that comes along; sometimes without even looking.  To me that's just stupid.  I prefer to look before I step.