I invest because I want value. I want to own a part of something that generates value to the world. I invest to meet my goals (which I've already done without BTC). I invest to sleep well knowing that my money is making me money. BTC offers none of this. I challenge you to name any value BTC provides beyond moving money from one jurisdiction to another. (Which is still value, but not one I need, nor feel the need to speculate in.)
Am I bitter others got rich? Nope. Do I wish I was richer? Not really, I'm doing fine, I don't spend what I have anyway. Do I worry about BTC mania infecting others and possibly causing harm where it's not needed? Yes.
That is why BTC is a bad idea. It's pure speculation. There is no value beyond what someone else will pay you for it.