That is indeed necessary.

But it seems to me that putting the interpreter in a place in the OS where it can cause a system crash with the be the behavior that it's allowed to do is a fundamental design choice that is not at all addressed by fuzzing.

An interpreter that handles data downloaded from the internet even. That's an exploit waiting to happen.

I guess "fight fire with fire" is great adage, so why not fight backdoors with backdoors. What can go wrong.