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My questions are:
→ Am I wrong to tell him to get out of the trading life in this situation?
→Am I asking for something unreasonable, or is this actually a serious red flag?
Honest and realistic opinions would really help.
Sometimes, letting them realize that what they're doing is wrong already is the best thing to do. You can give advice to him, you can tell him the consequences of trading, you can tell anything on him, but if he doesn't want to quit, he will not quit until he realizes it.
Saying to him to quit is a good thing, but if he doesn't want to quit, let him do whatever he wants to do. At the end of the day, there will be a point where he will realize that what he did in the past was wrong. You also said that he's also addicted to drugs as well, and that would just make things way worse for him because aside from his addiction to trading, he's also addicted to it as well. Quitting in trading would be easier for him if he don't have any money left. It's just a bit concerning that he has a wife that's getting affected. If you need to give up on him then so be it. Sometimes, we need to be cruel for the betterment of the person.
He's obsessed with the fact that he can make money thru trading, and yes, you can really make, but it will not take you 6 months or 1 year unless you're very lucky, but what are the chances for it to happen. Just continue to tell him to quit, but if he doesn't want to quit then just let him do whatever he wants to do. As for you OP, if you're getting affected negatively as well because of his wrongdoings, maybe it's better for you to stay away for a while.