Charity is about who benefits, not about who decides how to provide that benefit.
The idea of choosing a charity based on the donor’s will of how it will get spent describes almost all types of charity. If someone donates to any charity at all, they have made a choice on how to allocate their resources and they just take it on faith that that’s the people who need it the most.
Furthermore, any given dollar of his can only be spent once. The money he spent on himself enriches himself. It’s a considerable amount of money but it’s a tiny fraction of the money he controls. Any dollar he gives away can’t be spent to enrich himself.
Finally, Buffet has donated over $57 billion. How is he supposed to distribute that? Fly a plane around the country and dump cash out the window? Send a huge check to the IRS? Give it all to your favorite charity? The obvious answer is that he sets up an organization that will analyze existing charities for need and effectiveness and then distributes his assets accordingly.
I get the feeling of discomfort but it’s basically the same feeling we get when someone breaks a pencil
There is no evidence that a mosquito is capable of feeling the kind of despair or horror that a human would feel in a similar situation. It’s unlikely that mosquitos can form emotions at all.
At the same time, a huge portion of human-animal interactions involve the human controlling the animal in ways that they animal can’t even comprehend. A dog has no idea you’re doing operant conditioning to change their behavior. Pigs have no idea they’re being fed just so they and their children can be eaten.
The only way to avoid this kind of thing is to turn off your big human brain and go back to ape tier. We might need to go farther down the tier list than that though https://en.m.wikipedia.org/wiki/Gombe_Chimpanzee_War