>> If you really cared about the water problem, couldn't you have donated part of your (steady) income for that?
Lets look at this way - Regarding donating (or paying some one to do what you wanted to do) - Just look around and you will see serial entrepreneurs building their next company bootstrapping from their previous savings. They could well have paid some one to do it (coding, managing etc). Still you will see then right in the middle of the action. The simple reason is, most people love it.
Now regarding if you can't solve all the issues, then you should not solve anything (what are you going to do about hunger,,,) . So I want to solve the issues with payment processing and I plan to start a Paypal alternative. Here comes some one asking me "what about all these issues with banking " what about "all the other 1000s of problems with the financial sector" ? Can you solve everything ? If not, you should are you trying to just solve a Paypal issue ?