The thing that I was trying to say was that you don't HAVE to stay at flags. By the hockey metaphor I ment that you are just as able to take their flags as they are to take yours, if your willing to play the risk of going all out offence, even though it will fuck you over sometimes.
Have you never been in a field battle before? I've seen defenders cap flags plenty of times, although usually because the attackers went way too offensive and didn't leave anyone to guard their flags. Not because the defenders did a dumb thing like waste tickets on waves of attacks.