Decisions should be primarily based on facts.
I like the decision paper format that was used years and years ago, in my experience, in the Army. The sections went something like this:
It is a great format for laying out the choices that can be taken. The key in the above is the facts, and I think today we'll use the word "truths," and then the planning assumptions. This latter piece is your best thinking on a problem and what "could be" but is not absolutely known.
In today's world the truth seems to be lost somewhere in the mix of opinions and conspiracy theories that people come up with to spread more fog than knowledge. I like the signpost below that I grabbed from a New York Times article. Where are we headed and where can we find truth? All routes and signs don't lead to truth. There are no "alternative facts," only real facts.