One question
Who defines what is good or bad? Is there only one definition? (ok 2 questions
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Nothing defines good or bad, but we define good or bad by what is good for us as a society in general and what is bad.
Without getting in philosophic debates, Bitcoin, just like any other currency, can be used for good or bad. Just like a gun, you can shoot the bad guys or shoot innocent people, it's not the gun's fault.
Apparently not, both the article linked and the OP made a blanket assertion that Bitcoin is, at present, only used for bad things. And I disagree with your assessment that majority opinion matters. That means that if more than half of a population in a given jurisdiction decide that some activity of yours is "bad", then they will force you to stop under threat of official violence. That's highly questionable morality; if the activity isn't causing harm or loss, there is no justification for such behaviour, it amounts to nothing more than arbitrary bullying
Each of us define what is good or bad, people have different views about it. Generally if you hurt anyone with your actions that is bad thing, everything else what you do is I think OK.
I don`t think gun is a good thing generally, gun can just create suffer, in any way if it`s used. Who will tell who is bad and who is innocent? Gun as a thing is a bad product, anyone who use it is a bad person. There is better ways to deal with problems.
We have governments and laws, we have different rules. They define what is good and what is bad.