Generally you would hope a project is written in whatever the author(s) excel(s) at. I think that Linus and Co have clearly demonstrated they have a lot of experience doing C correctly, so you should have some faith that they know what they are doing.
They might not have similar aptitude with Ocaml or Python. Given enough time, all bugs are shallow, and Git is becoming popular enough that this becomes true. After all, Python itself was also written in C, so it is theoretically at risk to the same things.
(I obviously meant "Given enough eyes, ..." above. Not sure what my brain is doing today, but translating thoughts to keystrokes is definitely not working correctly.)
They might not have similar aptitude with Ocaml or Python. Given enough time, all bugs are shallow, and Git is becoming popular enough that this becomes true. After all, Python itself was also written in C, so it is theoretically at risk to the same things.