Hey, rather than add to the pile of explanations you’ve gotten so far, I just want to say it’s very cool of you to ask. Most people just decide they already know the reasons and then accuse us of lying when what we say is different from what they hear second or third-hand. You actually took the time to investigate for yourself, and that’s such a life-changing (often life-saving) habit, especially if you live in highly propagandized capitalist countries like most of us do.