What Good can come from a rant? And what does it day about the Ranter?

In my opinion is ranting not just a nice way of saying you want to b*tch about something? What good can come from a rant? Is a rant good when they hurt people? If you are friends with someone and you rant about something they do is this good? Why not talk to them?What Good can come from a rant? And what does it day about the Ranter?
If a person only does it when really worked up, okay. But if it's a habit, they're just whining and selfishly demanding attention for their irrational acting out when they could be doing something about the problem.What Good can come from a rant? And what does it day about the Ranter?
I know most people think ranting is idiotic, stupid, and maybe even immature. But the truth is, most people rant. Even when they can't help it. I hate to admit it but me and my friends rant about the most stupid things ever. But it really helps me relieve stress, and after i rant, i feel much more calm and relaxed. Its just fun gossiping about the people you may not like and i just thinks its rather entertaining. :D
Ranting lets off steam.