Why is science just a starting point and not an end point?

Properly derived science contains only provable conclusions that are bedrock.
All the rest is conjecture - interesting but not the basis for anything solid.

The problem is bad science.  This is in the ascendency.  One reads the most obviously idiotic nonsense every day, often obtained by extrapolation.  Extrapolation is always bad science.

The one I like best was around 15 years ago.  'All the snow and ice on the Himalayas will be gone in 30 years.  Palpable stupidity at the time; we're about halfway there and there's plenty left.  I said at the time that if the entire Chinese nation went up there with blowlamps working 24/7 it wouldn't happen.

Good science is a very high bar.  A theory must be proven universally true.  That is why science is always a long way behind conjecture.

But that is no reason to ignore good science and live by conjecture, as apparently do many people here.