Can you give one example of these broad assumptions and extrapolations you are making?
Have you ever listened to an actual scientist? They are the most aware of our ignorance and often speak of how we have so much to learn and how much we don't know.
Can you explain which scientist haven't a ghost of a clue of what they know and what they believe?
People all believe they are 'intelligent". Everyone thinks they understand science and its models as well as the experiments that generate them.
The reality is none of these things are true. The ability to learn from the insights and experiments of the past have nothing to do with what we call "intelligence" largely because no such thing exists. It is a function of language and not some imaginary attribute of the human mind. "intelligence" is an event and not a condition. The proof is all around us but we choose not to see it.
That people do not understand science is patently obvious. All you have to do is listen to what they say, do, and believe. Half of aviation engineers believe a plane can't take off from a conveyor belt moving the opposite direction. Even 3% of physicists miss the correct answer. Some of this is lack of care or playing devil's advocate but many miss it because they can't hold all the relevant parameters in mind and maintain a single frame of reference. Many don't really understand the nature of a wheel.
Nowhere is the lack of understanding of science more pronounced than among people who claim to be "skeptics" on the net. They have some idea of what reality is and they can't be dissuaded from it regardless of how wrong they are. The last hundred years has seen a steep drop off in the percentages of people with a working knowledge of simple mechanics and simple physics. But those who don't understand will still pontificate on why you're wrong about anything from initial Causes to planes glued to conveyors.
Without an understanding of metaphysics an understanding of science is impossible. Without understanding science it is virtually impossible to devise proper experiment or hypothesis. It is improbable experiment will even be interpreted correctly. This has always been true for modern science.
It is not true for any other life form which don't use abstractions and experiment. Any beaver can invent a new way to build dams. Very few humans have any chance at discovering the unified field theory and if one does it will be the result of an insight and not because they are "smarter" than everyone else.