Someone cut me off in traffic the other day.
That is awful.  Why do people risk their lives and the lives of others just to get a tiny bit ahead in traffic to where there going.  Ridiculous.  I'm glad you weren't hit.
I don't know why they do it, I feel the same way as you do.
I saw a guy cut someone off next to me, fly by over the speed limit, and cut a bunch of people off.  All to get ahead.  Then I noticed that I caught up with him because he got stuck at a light and all that craziness didn't even help him.