Well, biggest problem is that a lot of clanners use their own inferiority complex as an excuse to not fight. "I am small and gimp, and won't make a difference, and anyways I will just lag and die, so I don't bother showing up."
This stems mainly from having a hero mentality, where if you can't be Aragorn with the shiny sword and the amazing elven hawt babe, pwning the ev0l mosters and saving the day, there is no point of participating.
However, resisting the omnis isn't at all a matter of heros, it's a matter of pebbles. The thing with pebbles being; one alone doesn't really matter at all in the greater scheme of things, throw one at someone and they barely notice, but one pebble as part of 5000 metric tons of avalanche roaring down a mountainside does matter a great deal indeed.
Unfortunately, for most clanners the idea of being only one pebble in even the biggest of avalanches is intolerable, they find the very concept revolting. It's basically hero or nothing, and so they choose to BE nothing, even though they COULD very well be something.
Personally I was always proud to be a pebble, proud to be part of something bigger than me, however little my contribution really was in the greater scheme of things (and joining the big ppls wars as a tl4 advie pre-SL was very little indeed
), because I knew, in my heart of hearts, that SOMETHING, however small that something is, is better than NOTHING.
I have done my part, as I do now my part, as I will continue to do my part in the future. What other do, something or nothing, they must choose themselves.