What's really sad is the people who say "I can't save everyone!" and convince themselves that what they can give is not enough, so they give nothing instead. You do what you can. If you can donate money, even a little bit, you may not help everyone, but you can help 1 person. Maybe you can donate time. Maybe blood, or plasma. Maybe just understanding. Something is better than nothing.
Doctors Without Borders
Or even just donate your used cell phone to your local women's shelter. They will get it reprogrammed to only dial 911, so a battered woman has a lifeline.