In my opinion, bitcoin is exactly like fiat money. You can use it for good and for bad. It is in your choose what you will do with them. And I think that's the beauty of freedom, you can choose about for your own faith. So it's up to us to decide.
I think you musunderstood by the word "good" at here.What op mean by "good" is buying physical item with bitcoin.For example,grocery in super market and the other thing outside.