This is just a long-winded way of saying "if you can't solve everything, don't solve anything", which is no way to approach problems.
That's essentially the same argument, which is ridiculous. Of course you can. And you should. Just because you can't control the entirety of a system, doesn't mean you can't take steps to minimize risks and exposure, and shrink the attack surface.
For things you actually care about, such a surveillance, what if I told you there is a hardware backdoor in your CPU allowing the government to spy on you? Do you realize that is already known? What about the fingerprint scanner. How can you be sure the same is not true of the hardware storing that information?
The attacker can then reconstruct everything that happened on the CPU and work out what I've been up to. Or, more likely, throw away almost everything and only look at what was printed to the console, because everything interesting goes to the console anyway.
In fact this would be easier-than-average to achieve because the clock speed is low, I don't run the machine for very long or very often, and the density of actual electronics to "free space" on the ICs is very low (more space for shenanigans), and all my schematics are on my github project so even though you don't know which chip is connected to which other, you shouldn't have too much trouble deriving it.
So what now? Do we just give up? Is all computing fundamentally impossible? Or do we accept that nothing is perfect and just get on with it?
The point is, only my point is valid and anybody that cannot see that is stupid.
There, I think replicated the level of snark and useful discourse fairly well.