They are stuck in Plato’s cave allegory. Imagine 300 years ago suggesting there are atoms that can be split to release unbelievable amounts of energy. Or that computers can be created with tiny rocks and electricity. Speaking of electricity, pretty new too. We can vibrate our food to temperature in a little box in the kitchen now. Without modern tools and a foundation of research and development we would have never had any idea. How can anyone believe we are simply done learning anything new now? It’s a litmus test of ignorance imo.