You are right. But a friend who is selfish and only after himself should not be called a friend in the first place.Going into a business with a friend is something to be debated.
Going into a business with a friend in a way is wise and in a way it is unwise.
When you go into a business with a friend whom you guys have the same mindset, your business will prosper but when you have a friend who is selfish and is always after himself, you won't prosper.
There are friends, strong loyal and intelligent friends that you can still do business with. Doing business with a friend is not always a bad idea.