Is it permissible to trade with non-Muslims if their money is used to purchase weapons to kill Muslims?

If it is known that the owners of the website earn money to fight Islam and Muslims, then it is not permissible to deal with them, based on the words of Allah Almighty: "And do not cooperate in sin and aggression." However, merely because the owner of the website is not Muslim, without knowing how his money is spent, does not prevent dealing with him. One must be wary of extremism and obsessive doubts.