Yes, people think money is something that can't buy happiness but if we think of people who don't have money and struggling everyday for a single penny in order to get food then we will get the answer... If they have money they won't need to struggle that hard mind you sometimes it's hard to get happiness like some people depends on love and find happiness with their partners so I am on the fence neither on the negative side nor the positive one
Actually money and happiness are related. If you argue between those who say money is not happiness and vice versa, I don't think you will find common ground. Because different people have different opinions. We can only argue without blaming other opinions. We need money as well as happiness, this is really inseparable.