Just mapping out possibilities here: is it possible that we all have what they are testing for but sometimes the test does not detect it and sometimes it does (making the test kind of like flipping a coin or a magic 8-ball, having nothing to do with whether or not we have covid either way)?
I think there are too many variables to look at it that simply.
The explanations that I have heard that make the most sense is that the high incidence of PCR test positives are due to the cycle threshold (CT) being set too high (this is what causes amplification or replication. The PCR process cracks in half the DNA/RNA/Gene being processed, then it is mirrored (creating two from one), the process is then repeated several times to create multiple replicants, so the math looks like 2^N. The CDC recommends 35 cycles, Fauci recommended not going over 30, but appeared to believe 25 was quite sufficient (a statement he made at a conference in the June/July time-frame), because more amplification than that was as likely or more likely to make something insignificant seem significant (i.e a false positive).
2^25 = 33,554,432 replicates
2^30 = 1,073,741,824 replicates
2^35 = 34,359,738,368 replicates
2^55 = 36,028,797,018,963,968 replicates
2^60 = 1,152,921,504,606,846,976 replicates
Apparently Quest and Labcorp are the two main labs performing the tests and they recommend running the CT up to 55 or 60 (hence the numbers being included above). This statement is based on an FR post I read a few weeks ago where the poster challenged people to go look for themselves at the info the companies provide for guidance. I’ll see if I can locate the post.
Also remember, everything in the sample is getting replicated.