Here is an example of technology that could blow up in one’s face, like the cartoon cigars, in a worst-case, as yet, hypothetical scenario. Molnupiravir is a drug given to vulnerable Covid suffers who may be fighting cancer or liver and kidney disease. However, wonderful as that is, there are concerns that the mechanism by which the drug works could backfire. The drug causes mutations in the virus, supposedly weakening it. But, there have been concerns raised that some that mutations may not kill off the virus, make the virus more transmissible or severe, or allow it to bypass immunity from previous infections or vaccines, or produce new variants.
Are just concerns justified? We simply do not know yet; it is yet another great unknown in Covid research. But if true, it could be a problem, depending upon what the mutated virus is like.