Because C makes it really really easy to write test-free unsafe crap. The list of bugs caused by use if C is genuinely ridiculous. Now, I think there are ways

Because C makes it really really easy to write test-free unsafe crap. The list of bugs caused by use if C is genuinely ridiculous. Now, I think there are ways to write robust C - I don't get many bugs now that I usually use AddressSanitizer and a static analyzer (the GCC one is really nice) but that simply isn't good enough any more for high-reliability code.