We can't change the world? Oh gee, I guess I'll just go back to eating Doritos all day and watching reality TV. What's the use of trying when I won't ever make any impact? /sarcasm
Take your fatalistic attitude somewhere else and preach it to losers who care.
I think what he meant by that is there are people in the world you CAN'T change, people who would rather sit around waiting to die than muster up the grapes to fight for what's right. I guess there were 2 ways you could have interpreted that, but I'm in agreement with you. If you don't believe that standing strong against what's wrong is worth it, then you're already dead inside and you serve no purpose to anyone besides the enemy.