1. I am well aware this will get downvoted. g'head and make yourself feel better about yourself and hit that button. It is what it is. I will lose zero sleep.
2. Said this many times. There is a reason the book says see and avoid and not hear and avoid. Many reasons actually.
3. Before you judge me, walk a mile in my shoes. You haven't done what I've done. You haven't seen what I've seen. You haven't experienced what I've experienced. So I fully understand you don't understand why I would do such a thing and be ok with it. And no matter how I try to explain it, you likely still won't understand it or at the very least, you'll still argue against it right up until you experience what I've experienced. There was a time when I would've done the same but now things are different for me.

Now all that being said, while its been years since I've been current to fly, back when I was and even now, I LOVE making radio calls and always did so whenever I was able.

But I spent a lot of time flying company airplanes (banners) that were tied down outside. And for the main plane I flew, I kept the correct size allen wrench in the seat pocket so that anytime it had rained at all since the plane was tied down, I could unscrew and remove the only radio from its cradle and hold it outside the door and tip it down long ways to let the several tablespoons of water that was inside of it dump out on the ground.

Then I'd reinstall it and sometimes it would work and other times it just wouldn't until a day or two of dry weather went by. And that doesn't even begin to factor in the times we'd show up to find a bad alternator and/or a dead battery so we'd have to hand prop and you flew that day with no electrics at all. Happened way more than you'd expect with those work planes so it just became a way of life. Use the radio if you have it, don't sweat it if you don't.

And if you do that for any amount of time at all, you quickly get to a place where it becomes use the radio if you have it, don't sweat it if you don't and don't sweat just turning it off if the frequency is constant feedback from over saturation and/or being dominated by yokels discussing what they had for breakfast and what hunk of meat they're going to barbecue later that day.

That's just how it was/is for me anyway. But if you're going to be in a place where you accept that sort of thing at all as a reality you partake in on occasion, you also have to accept that there will be those make that their reality even when there is no logical reason to do so. NORDO guys are out there and they will always be out there. Some have good reason. Other don't. Reason doesn't matter. They exist and you need to fly accordingly. That's what matters.