Aiding in Sin

Q: 

1. Would it be halal for me to sell gold to a cash for gold place because there is a high chance they will sell this gold to a refiner, scrap gold buyer or so on and they might use this gold to make gold jewellery for men etc.? 

2. What about selling grapes to a business that sell grape related products so the grapes I sell to them can be used to make their grape juice or it can be used for their wine etc. Will the income be haram? Because I’m unsure what they will use it for.

Q: I am currently sharing my mobile data supply with my friend who often uses the data to watch movies. Am I thus assisting in sin? Will I be accountable for all that he watches?

Q: An old school friend that does not practice deen (I don‘t exactly know his belief) and his girlfriend (I think she might be Christian since we are in Germany and she’s German) went to another country for holidays.

Now they want me to pick them up from the airport and bring them to their home where they live together. Since I don‘t want to be sinful I would like to know if it was haram for me to transport these people.

I read that transporting people to certain places as a taxi driver is makruh tanzihi in the Hanafi madhab since one is only indirectly assisting in sin. However, I am not a taxi driver and I don‘t want to make assumptions.

Am I sinful for transporting non married couples to their home?

Q: If a husband and wife are watching a movie together and certain scenes the wife is uncomfortable watching due to she feels its haraam for the eyes and is wrong to see, but the husband feels it is her insecurities and feels since it is part of the story and movie it can be watched, please advise.

Q: Am I sinful if I see a family or friend saying or doing something haraam and I don't denounce it. Ever since I found this out, I have been telling people so politely but now I keep spotting things and because I keep denouncing things, I lost so many friends in the past as they find me annoying and it makes my life miserable. Is denouncing a sin in my heart efficient or am I sinful if I don't say anything?

Q: If someone's father is doing unjustice to one's family, should he leave his father or not?

Q: Is it permissible to flatten someone's car tyre in order to prevent them from using the car for sin?

Q: If a Muslim has a group of Muslim friends. The man knows zina is haram. His friends dont know zina is haram. The man invites them to commit zina. They all go and commit zina. The man doesn't commit zina.

1. Will the man be getting their sin of zina or he wont be getting their sin of zina since the friends were unaware of the act being haram?

2. Is the man guilty of kufr because his friends did not know zina is haram and they thought it was halal and committed it. (Thinking a haram act as halal and doing it is kufr).

Q: I have plans to open a hotel in the area I live in as there are many tourist attractions here. I need to know the ruling when guests come to my hotel and bring alcohol from outside. What am I to do in such a situation?

Q: I have a Muslim worker who is addicted to mandrax. Daily after work he must smoke. Sometimes he works late and the place where he needs to buy the tablets (drugs) is not safe so he asks me to take him there so that he can go in and buy it and I must drop him home. If I don’t take him, he will walk down and it’s not safe. I have been doing that but it’s bothering my mind, am I not a party to the sin? What should I do? Even though by my not taking him he won’t stop.