[antisthenes]

> Millions of children on this planet are malnourished or suffering because of wars, climate change or just bad government.

This assumes every child is a net positive for its immediate group, its local group, its country and the global world as a whole.

While you can argue for the first, the latter 3 are not evident.

> Is it ethical to pay a fortune for magnetic brain stimulation of your dog, if somewhere else in the world several people's lives could be saved with that money?

Is it ethical for you to be typing this comment, whereas you could be working instead to earn money to buy food to save several people's lives somewhere in the world?