Lack of knowledge.
But I think the biggest reason for apathy is that people have come to believe it doesn't make any difference anyway. For example, people don't vote because they think one vote is meaningless.
Well, a recent study by the Barna Group indicates that this is the case with world poverty. People don't want to try because they think it's pointless. But the study also indicates that they are wrong.
How so? In the last 30 years, the percentage of people living in extreme poverty has dropped from 52% to 31%. However, 2/3 of Americans think it has increased.
A summary of the study can be found here:
Global Poverty Is on the Decline, but Almost No One Believes It
I encourage you to read the article slowly, and digest what it is saying. But even if you do not, the bottom line is this:
The fight against world poverty is making a difference. It's not a hopeless cause. So please realize that you can make a difference. And if you are a follower of Jesus, it's your responsibility to do your part.
So..let's get to it.
Then the righteous will answer him, "Lord, when did we see You hungry, and feed You, or thirsty, and give You something to drink?" The King will answer and say to them, "Truly I say to you, to the extent that you did it to one of the least of these brothers of Mine, even the least of them, you did it to Me." (Jesus, in Matthew 25:37,40 [NASB])