Genetic engineering is banned because people will almost certainly use it for something else more nefarious than cure AIDS the first chance they get.
You're also just wrong - the first scientist to genetically edit human embryos edited in immunity to AIDS.
A huge chunk of the environmental disaster we are facing is because Europe and the US didn't go the nuclear route like France did in the 60. We could have had this crisis we're having now in a few hundred years instead.