I did felt uncomfortable knowing that Bitcoin enabled criminals, but I don't believe it affected my decision to sell.
It must've only affected your decision to buy, which is even worse.
I don't understand why you would assume that, but if you have to know I didn't realize it at the start.
But it brings up an interesting discussion. If we look at just the morals here, and forget about the money. Assuming that you know for sure Bitcoin is helping criminals, should you stop using it?
I think we all know what the answer is here.