But again I tell you, using Bitcoin to buy Heroine from the dark markets is actually one of its greatest use cases to illustrate censorship-resistance - the network's main value proposition. That it can't be shut down even if it's being used for "bad use cases" shows that it works.
But if BTC continues to be misused like this then authorities will take some bold actions against it
Misused"? Who said it's "misused"? The participants in the transaction were merely using Bitcoin in a way that you don't approve of. And if the authorities should take some bold action against it, then it should first take bold action against the Banks because the most used currency for crime is? FIAT.

but i think your intentions are just to show that BTC could be used for anything, and those authorities still cannot do anything at all and i am agree with you.

No, my intention was to show technically how and why Bitcoin could be used for anything.