Then you are suffering strongly from the Bystander-effect. http://en.wikipedia.org/wiki/Bystander_effect

One could translate this effect as "the warm fuzzy feeling that there are enough people around which will do the job and oneself doesn't need to bother".

The effect is very strong. So, adjust your thoughts: The barbarians will kill you either way. There aren't enough people which care, so you yourself have to rise to do something. (That also applies to everyday life: If you want something done, especially in a busy and people-rich environment, do it yourself.)