I believe the overwhelming majority of scientists are honestly doing what they perceive as the search for scientific truth. They just don't seem to appreciate the very elusive nature of truth because, like scientists throughout history, they believe they know more than they actually do. It's a case of misplaced egocentric behavior. Those in academia are also severely pressured to accept certain truths as a prerequisite to keeping their jobs. This is true in all fields of academic study, not just science. It is a major unconscious failing of human nature; that tribal, monkey-like group-think that impedes progress and causes all kinds of terrible strife.
That's the power of science. It is self-correcting process that drives to improved understanding regardless of our species' fallibilities. Individual researchers can be capricious, stupid or corrupt. The amazing thing about science is that, in the medium to long term, it doesn't matter. The process of science will eventually drive to improved understandings.
BTW, no good scientist ever talks about Truth with a capital "T". The best science can do is arrive at contingent truths. That too is a fundamental difference from past paradigms of understanding. Science relies of reproducible evidence, not reference to authority. Science it ripe with false starts and faulty branches, but eventually evidence mounts to halt or change the contingent understanding.
This does not mean nothing in science is concrete. As hypothesis continue to stand the constant challenges put to them, they eventually move to the level of scientific theory. Scientific theories are not someone's kooky idea, they are concepts that are as near to certain as any knowledge can be.
This is why I think science (which is a process, not a thing) is the most amazing development to come out of homosapien evolution. Despite all our inherent limitations, our "monkey-like group-think" as you put it, we have devised a process that still produces improved understanding of the world around us.
... sorry for the tangent. Now, back to frugal cruising.