Re: old skool
> there's no way to realistically read every line of code and be sure about everything in all things
There is every way to do so. The question is whether that would be less onerous than writing the code yourself.
If you import free third party code into your program without knowing it inside and out, and it turns out to be malevolent, then you were reckless., If it turns out to be buggy, you were negligent. Better to write your own buggy code. At least then you'll have a chance of fixing it.