I think the answer to op's question depends a lot on the circumstances and personal beliefs.
Do you think that dealing drugs is a crime (not from a legal standpoint, but from a moral standpoint)? What kind of drugs or does it not matter to you? Another question is whether this person wants to abandon the current activity for something Bitcoin-related or not.
To me, it matters what kind of drugs the person's dealing, whether this person is engaged in other, more violent forms of crime, and it's a big plus if this person is seeking to escape the drug-dealing industry.
I wouldn't help a violent person, or someone who deals heroin and something of similar very strong and very negative impact. I also wouldn't help a person who deals drugs to minors. But if it's something lighter that adults get for themselves, and the person is alright (not aggressive), I wouldn't hold it against him.
All that aside, I wouldn't give anyone financial advice, I can merely help to learn more about the currency, wallets, basic security, and stress the risk of investing. Also, I wouldn't normally dedicate my time to someone I'm not friends with, unless it's something like paid private lessons.
I do not teach people how to handle bitcoin even if they are not drug dealers so it is not anymore of a moral question but about more like saving myself from headache. That solves the issue pretty quickly, he could have been a doctor saving lives and I would still not teach them how to get bitcoin, that's not my job nor my place.
We live in an online world now, go to google and type in "how can I buy bitcoin in X nation" wherever they are, if that doesn't solve your question neither can I. Why would I have to deal with other people, why do I have to teach them, what's in it for me? I rather not do that at all and let them be. This way you do not have to ask yourself if he is doing a good thing or a bad thing, because it becomes irrelevant.