1. It's fun - it feels good.
2. In the hands of a real master (i.e. someone really creative) it can be both funny and creative.
3. It reduces anger and stress.
4. It can reduce physical pain (I'm posting on my phone ofherwise I'd provide any number of links to this effect).
1. I may be fun to a certain, crude, type. It may not feel so good to the listener, or the person on the wrong end of it.
2. It's never funny, except to morons. And to consider it creative rather demeans the concept of creativity.
3. I think it equally likely to increase anger and stress, both to the swearer and to the listener.
4. Rubbish! It may engender a sense of satisfaction to the Neanderthal doing it, but not to those unfortunate enough to be in hearing, unless they are equally dim.
I note that all your justifications show no consideration at all to those who may be in the hearing of the swearer, or may be on the receiving end. Typically self-indulgent and unsympathetic.