"What if it's late," "What if someone dies", "It has to go perfectly or else." Mate there's no reason to slow down or criticize science and engineering for being late, having a death, or riding the razor's edge. Just get shit done. That's all that matters, this kind of internet fear-mongering is absolutely detrimental, even if there are huge risks involved in the process. We're not going to mess up the planet, but nay-sayers will absolutely slow us down.