The first murder as in the Bible was by
Cain who was a
farmer living thousands of years before science and scientists existed. Unless you have a list of the papers that Cain published

?
We should trust "the scientist".
Scientists are educated to be trustworthy. Postgraduate work is about producing research that has good, trustworthy evidence behind it.
Scientists have their work extensively checked. The process of peer review by experts goes thru discussing the work with colleagues, presenting it at conferences, submitting it to a journal where an editor looks at it, formal peer review before publishing and then lots more peer review by people reading the paper. Experiments are expected to be replicated and improved upon. Theory is used in other papers with their own process of review.
You are right, "the scientist does not always do it right, because they are human"
which is why we have scientists and other people checking the work. That reduces mistakes to an generally extremely low level (varies according to the subject). There are even scientists who study and publish on those mistakes, e.g.
A Comprehensive Survey of Retracted Articles from the Scholarly Literature (2012) found "4,449 scholarly publications retracted from 1928–2011" out of several million publications. The checking is a reason why we see cases of
scientific fraud and misconduct exposed.