It may not seem like it, but folks are trying to help you do what you are hoping better than you are already.
Charitable giving is a competitive marketplace.  There are many choices.  You must know that already.
To be the best choice for someone's giving, listen to those who seem critical and understand what they are explaining.
If you look at the number of views, for your post, and how many have commented, and then at your wallet, you might see that some folks just look and move on silently.
Those that took the time to tell you what you can improve are the ones that are doing you the favor of telling you why the others left without donating to your cause.
Do not let your kind heart be hardened by the criticisms. 
The children you are helping are depending on you to not get discouraged.  Don't let them suffer by taking offense.  Do the hard work needed to help them.
Good luck in your effort to do something meaningful for yourself and others.