The problem is deeper than this, though. All of the "scientific method" theory which is meant to ensure reliable results applies only to experiments and observa

The problem is deeper than this, though. All of the "scientific method" theory which is meant to ensure reliable results applies only to experiments and observational studies. Syntheses are just prose - there's no particular reason you should have confidence in a synthesis if you don't think the author shares your values or it contradicts something else you strongly believe is true.