This was your first post in this string. It's smart, it makes sense. It's not just about COVID, it's about any and every illness. I 100% agree with you.
The highlighted part in red is still relevant. I agree, lots of people don't stay home when they feel sick. It's not just about COVID, it's about any and every illness. If you feel sick, stay home. Simple and clean message that should be driven home over and over again. It's completely unnecessary to conflate the "stay home if you're sick" message, with some idea about testing for a specific illness. The illness is irrelevant, you can harm others by spreading COVID or the flu or RSV. So if you're feeling symptoms of any of those, stay home. Simple message of basic health.
The rest of that diatribe is on you. You're choosing to continue to carry around that cross, beat that horse, tilt at that windmill. Your aims would be better served by sticking with the simple health message.