The Athletic interviews the Cardiologist who is advising the B12 today (paywall).
Michael Ackerman advised conference and school officials from the Big 12 it would be safe to proceed amid the virus.
theathletic.com
I read the piece and while he tries to describe other leagues as being alarmists, it honestly just cemented my opinion that the P12 is doing the right thing.
Basically, you have no data that states it's 100% safe to proceed and be able to control the virus, and what the outcomes will be for those who survive contracting the virus (long term heart problems being the biggest concern). He makes the point that we just don't know.
So "if we just don't know", it seems that the NFL can make a decision, but I'd expect the leading Academic Institutions in the world to make a much more conservative decision, which they've done. Partly, because they are Academic Institutions, not Pro Football leagues (primarily) and second because the players aren't really being paid, they are getting just a free education.
So the answer really lies in what is the mission? In the SEC, it's football. In the PAC12, it's higher education first. Simple.