Of course I don't know but I'm sure no one of my coins is from an outright hack.
If you don't know your coins' history, you don't know that either.
Of course, intention does matter.
In my opinion, it doesn't. I don't care if your friend has ethical concerns with the coins they receive, or if they want to sabotage Bitcoin. The result is the same. In either case, they treat the currency as non-fungible, which ultimately does the same harm.
If a legitimate buyer wants to purchase Bitcoin legitimately, what he'll receive anyways, of course he is entitled to request this sort of information.
Lol. Since when do we request this sort of information? It's the first time I've ever heard this as a need. Not caring about the history of my coins has worked fine so far.
Maybe he's a hacker and a criminal who's trying to get rid of stolen and hacked coins?
I must have received plenty of bitcoin which were involved in some illegal activity. I share no concern, just as I share none with the cash I spend everyday. The public availability and interconnectedness of transactions does not imply that I am correlated with the financial history of my coins.