Science Kids Bringing Back Extinct Animals - Should We Just Because We Can The pros of gene splicing include the potential to bring back extinct species, advance medical treatments through CRISPR and optogenetics, and gain a deeper understanding of genetics. However, the cons involve ethical concerns about interfering with nature, potential unintended consequences of altering DNA, and the risk of accelerating climate change by reintroducing extinct animals. Ultimately, gene splicing presents both exciting possibilities and complex challenges that require careful consideration and ethical deliberation.