I believe there are always some people who see war as a good thing, and I don't mean people who've posted here. They see it as a healthy thing for society, tightens things up, speeds up technological development, gets rid of the flabbinesss. But that'sa maytter fpor another thread - and there's a good choice of threads about that stuff.

My feeling is that if you're looking for the right thing in the first place, you ought to be looking for it all through your life, until you find it - and then you are looking to preserve it.

Of course you might find you are looking for it in a different place. Or you might decide you were looking for it in the wrong place.

So that makes three reasons you might change - one is that you found what you were looking for, and move from looking for it to defending it. The second is you realise that it's to be found in a different place. And the third is that you decide you were looking for the wrong thing to start off.