Even though this is a troll thread, I'll post in it anyways.
Why? Because he's an example of a true human being. In anime and manga, a lot of characters are shown to not care what other people think and a lot of the time don't do anything for anyone. Or are the stereotypical 'nice' main guy.
Inuyasha though, no matter how hard he tries, he can't help but want to help people in some way or another. Even though it gets thrown back in his face in the end, he's one of those characters which will learn to forgive even if he doesn't want to.
Even in the real world, where there are 5 assholes, there's 1 nice guy who will forgive them. Inuyasha is a great example of this.
This is why Inuyasha is a great series as well.