You can do it once in your life on a single machine. From there you compile the software for other machines. It is like a tree whose fruits you trust because yo

You can do it once in your life on a single machine. From there you compile the software for other machines. It is like a tree whose fruits you trust because you planted it yourself (actually it is more like if you wrote the seed yourself) and use it to plant other trees. Only remaining vulnerability is the hardware, but as I like to say: security is not binary.