alright, i'll assume no bad intention in your post. aside from excellent reasons like mentioned by         , i usually give a thought exercise example. i ask you first to imagine two things: > 1 > someone you consider an example of a perfect person (and consider it 100% pure/well-intended) becomes the supreme leader of your country > 2 > your country starts its process to become communist since i live in a christian country i normally ask people to imagine jesus without his supernatural powers as the "commie leader" of this exercise, but you can really imagine whoever you want (even someone who doesn't exist). i'll say jesus from now on only to keep it simple. so, imagine that jesus wants to end starvation. his first order is to give free milk for everyone and so it's done: on the 1st week, everyone is happy. then, the next week, there's no milk. jesus checks what happened and then he saw milk producers couldn't get hay for their cows anymore due to the increase in production, then jesus orders hay to be given to milk producers. there's milk once again! on the 3rd week, no more milk. jesus goes check what happened and he learned that hay producers couldn't keep up production; then he demands manure producers to give manure to hay producers who will give hay to milk producers... ... i think you got the idea. even with perfect good intentions you would have to deal with imperfect beings and systems.
Brazil