A lot of the original C coders are still alive or only very recently gone (retired, or the ultimate retirement, so to speak), and they carried their cramped coding style with them from those ancient and very cramped systems. Old habits die hard. And then there's a whole generation who were self-taught or learned from the original coders and there's a lot of bad habits, twisted thinking and carry-over there too.

(You should see some of my code. On second thought, it's probably best you don't.)