C programmers should be held personally accountable for the damage they cause.
Now of course everybody makes mistakes, but if you deliberately choose C when there are better options available then you should pay out of pocket for your buffer overflows and 0-day exploits.
Level 1: let interns use Go(-karts), like their parents did with Basic.
Level 2: most languages. Proper training required and you still have to be careful.
Level 3: C, C++, critical code, kernels, crypto code. Training a commercial airline pilot takes years; and while this stuff is not hip enough for some, there's plenty of demand.