In his novel, Jurassic Park, Michael Crichton builds on themes developed earlier in H.G. Wells' Island of Dr. Moreau, in which human experiments with biology lead to catastrophic consequences. The story is a cautionary tale concerning scientific arrogance. The scientists in the story are too confident in their own abilities and take insufficient precautions with their experiments, and are unwilling to respond sufficiently quickly when evidence starts to point to there being problems with their project.
There are several moral conclusions one could draw. First, that the possibility of commercial gain leads scientists to take unnecessary risks. Second, that interfering too much with biology can have adverse unforeseen consequences. Thirdly, that we should not arrogantly take for granted the ultimate supremacy or survival of the human race.