[PeterisP]

It's not inherently prudent to wait and do more analysis; proceeding too quickly is dangerous since it may do harm, but proceeding too slowly is dangerous since people are dying right now and needlessly postponing a solution means needlessly murdering many people. There's a tradeoff of "carefulness" where beyond a certain level waiting to do extra analysis is harmful. For this particular species of mosquitoes we currently have a good reason to believe that we are beyond this point, we have enough information about the risks so that it's prudent to go ahead and, well, save lives.