And that is what is being trusted. Not "the code is readable therefore trustable". More "the code is readable, therefore I trust multiple someones, somewhere

And that is what is being trusted. Not "the code is readable therefore trustable". More "the code is readable, therefore I trust multiple someones, somewhere will read it or has read it and if they have a concern they will voice it". Is it the greatest thing to trust? No, but like a lot of things in life, it's the best of the practical options.