@Olivier5,
You are confusing science with scientists.
At the core of science are a set of rules that govern nature. These rules existed long before human ever evolved, and long before any life on Earth started replicating. These rules are unaffected by human ideas or ideology. Now.. you are right that scientists, as human beings, are subject to prejudice and ideology and hopes and fears. But
scientists are not science.
The key part of science is that experiments are objective and reproducible. It doesn't matter who you are or what your ideology, nature works the same way for a modern citizen of the US as it does for someone from China, or from 1000 years ago, or even a prehistoric worm. If a prehistoric worm put an electric charge across a semiconductor junction, she would get the same result you get today.
When two scientists have different opinions on a scientific fact, there is an objective way to determine who is right and who is wrong. You rely on experiment. At this point the personalities, ideologies or prejudices don't matter. It is possible for a person to ignore the scientific result of experiment.. but they do this at a cost. In science there are right answers and wrong answer.
The side with the right answers is the side that builds airplanes, develops computers and sends robots to Mars. You can't do these things if you put your ideology in front of the facts of the experiments.
You are right that human beings, including scientists are subject to prejudice. So let's talk about why science has accomplished so much. We are flying around in the bellies of giant birds, and transmitting our ideas around the world almost instantaneously and driving around in carriages that move themselves.
These aren't things that were created by ideologies. They were created by understanding and harnessing the rules of nature.
Science now has an advantage. We have set up institutions that allow the scientific community to advance rapidly. Experiments are done on a world stage. Results are shared and criticized and analyzed by people in many different settings. And the results are pretty spectacular.
You may suggest that this isn't a perfect system... and I would agree. But it is a pretty damn good system, and the results are pretty amazing.
As you type your response, consider the irony. You are typing on plastic keys (a material that didn't exist 150 years ago) on a device that relies on Quantum Mechanics (which wasn't understood 100 years ago). And, you are transmitting your ideas at the speed of light to us all, something that 100 years ago would have been considered magic.
This is what science can do.