I think it is the same problem with governments, but amplified by some neo colonial guilt trip; the charity is so far removed from the people the claim to help. Just think of the "overhead" and promotional costs. Much like governments they move from being subservient to "the people" to being obsessed by the wellbeing and growth of the organisation: so they cover up abuse because it would "hurt the cause" if it came out, while in fact it would only hurt their bottom line.
Second, it doesn't help to pump money in to a corrupt system, you will only amplify the inequality. Low trust, high crime communities need to change their morals before thinking about infrastructure.

I never gave money to "charities" were directors take home six figure checks. I distrust people without "skin in the game".