An asteroid coming to planet earth.

The above is a fact. NASA picks it up on imagery, etc. It's a fact.
Is the asteroid coming to earth changing constantly? Yep. At one moment it's 50,000 or so light years away, then 49, 999, etc. Fact is, asteroid is coming. Changing constantly? Yep

The line set at 3.5 is set at 3.5 right now. That's a fact, period. What goes into setting the line at -3.5 is certainly opinion based, and some facts are also included, but if the line is -3.5 right now, it's minus 3.5, period. That's a fact.

When people bet against the -3.5, that's an opinion. Therefore, if you don't understand this concept, I would say you need some serious mental adjustment.