These movies depict science in both negative and positive ways and explore the possibility of horrible things happening if it goes awry.
In a positive way both movies try to portray science as an opportunity to explore the unexplored. The goals were to make scientific advancements that could be used for good. In the movie The Fly it was used more as a scientific way but in the movie Bride of Frankenstein it was for personal reasons. Sometimes scientists do not look at the negative outcomes that can be caused by their experiments.
Unfortunately, both movies ended up having terrible outcomes. Science was not necessarily used to better the scientific community but certain details were overlooked and both movies had horrible outcomes.